**The Pi3 has been pushed to it's manufacturing limitations, and it runs hot. With the Pi3, if you are expecting to get any kind of performance out of it, you are gonna need to set up some kind of cooling.**

SoC hot!!!

SourceRaspberry Pi 3 Thermal Photography

The BCM2837 system-on-chip (SoC) in the Raspberry Pi 3 gets far, far hotter than its predecessors. If you're planning to put the Pi 3 in a case, you're going to need to invest in a heatsink and make sure there's at least some ventilation

Using my Pi3 as a test subject, for determining optimal cooling capabilities, optimization via overclocking, and running bench tests on that optimized Pi, I figured I would show it off firstly....

**Screen Blanking and Lock Screen**:

First thing i did though, was disable that annoying screen blanking. I set the Monitor to turn off, and go into power save mode when I wanted it to, and to use a keyboard shortcut to ScreenLock via

**Light-Locker**. For more info, and Instructions on how to disable screen blanking, and enable screen locking (xscreensaver sucks), see: viewtopic.php?p=961360#p961360

My Pi3 desktop (I am partial to the Windows layout and "Start" buttons, and i like to switch between visual themes...I have three themes,

*Raspbian*,

*Kali*, and

*Veil*) If you are gonna turn the Pi3 into an overclocked Desktop PC, make it look awesome! Right?

(If you want to customize and modify/change your look, or theme, see: viewtopic.php?p=969008#p969008)

**KALI**

**VEIL**

**Raspbian**

The easiest way I have found is get an oversized heatsink, and fan.... Cpuburn-a53 is designed to heat up the pi3, and I can run it with ease overclocked @ 1.3 Ghz, and thermals never exceed 50C. I can run Stress at 38C, Sysbench at 37C, and Idle at 26C... Whether you are overclocked or not, If you have an overheating issue, this is how to resolve it.

*EDIT*

1.3 GHz overclock failed on Linpack, so arm overclock reduced to a more stable 1.26 GHz.1.3 GHz overclock failed on Linpack, so arm overclock reduced to a more stable 1.26 GHz.

*The heatsink pictured below is custom machined for me by a friend (I have two of them), and is made of anodized aluminum. The outside dimensions are L.87" x W.96" x H.70", and the centered 'socket' on the bottom is L.66" x W.66" and .010" deep.*

You may be able to order custom sized Aluminum heatsinks, for example:

https://store-ddfcc.mybigcommerce.com/c ... 0sehsi41h1

*The cooling fan is 12v 70mm x 70mm x 10mm, and sells pretty much everywhere for around $4 - $7 or so. It runs quietly on the GPIO 5V rail.*

*The case is the "official" pi3 case, which runs $8. (fan itself is removable, and is held in place with Velcro-like fasteners. An 18 pack of Scotch 3M reclosable fasteners runs like $4)*

**Is the 12v fan quiet? Does it efficiently cool the pi3?**

https://youtu.be/0bso6ucTuH8

**Fan Push or Pull, which is better???**

see: viewtopic.php?p=963540#p963540

**Overclocked "Hot Rod Pi3 Extreme"**

**Under the hood:**

Stable Overclock (utilizing the below tests):

Stable Overclock (utilizing the below tests):

(add to /boot/config.txt above 'gpu_mem=')

Code: Select all

```
dtparam=sd_overclock=100
arm_freq=1260
core_freq=500
over_voltage=4
sdram_freq=575
sdram_schmoo=0x02000020
over_voltage_sdram_p=6
over_voltage_sdram_i=4
over_voltage_sdram_c=4
v3d_freq=500
h264_freq=333
```

**If you want to test your pi3:**

**Why should you care if your overclock is stable, or not?**

Unstable overclocks can eventually lead to premature hardware failure, malfunctions, crashes and data loss, as well as sdcard corruption.

If your Pi3 should freeze up, or otherwise become unresponsive during tests, DO NOT remove power, instead reboot with 'alt'+"sysrq"+"b" ('sysrq' is also known as 'prtscr' key). Hard reboots (where you unplug power, then plug it back in again) can result in data corruption!

Two things before you start, make sure you have the proper power supply, and some kind of cooling capability... fan and/or heatsink (preferably both).

Power supply for Pi3 (power draw when idle): Source

5.19 V 1.141 W

0.22 A 00006 mAh

Get yourself the official Pi3 power supply (5.1V 2.5A), or the 5.25V 2.4A power supply

////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////

TOP (hit '1' to see all cores with loads):

Code: Select all

`top`

(test the hdpharm and read/write performance of your hc-1/uhs-1 micro sdcard). Average is 50 MHz 20 MB/s Read; 12 MB/s Write, or with sd_overclock 100 MHz 40 MB/s Read; 20 MB/s Write.

MEMTESTER: (set "gpu_mem=" to 64 prior to run, and reboot after install)open, and 'select all':

http://www.nmacleod.com/public/sdbench.sh

then:...and paste the text in, then save with Ctrl-X, Y, Enter.Code: Select all

`sudo nano sdbench.sh`

Make it executable with...Then run:Code: Select all

`sudo chmod +x sdbench.sh`

Code: Select all

`sudo ./sdbench.sh`

(test your sdram, battery of tests will indicate pass/fail results. you want 'pass' across the board for 5 sequential loops. set 'gpu_mem' to 48 prior to test for optimal results)

Code: Select all

`sudo apt-get memtester`

Code: Select all

```
memtester 700m 5
```

(basic cpu performance benchmark. prime number cruncher (up to 20000) with validation)

average stock Pi3 benchmark total time is 119.4716 seconds (faster is better).

Code: Select all

`sudo apt-get install sysbench`

Code: Select all

```
sysbench --num-threads=4 --test=cpu --cpu-max-prime=20000 --validate run
```

(puts a near "real world" full CPU load on pi. If you throttle on this, do not attempt cpuburn-a53 as you are inadequately cooled

Code: Select all

`sudo apt-get install stress`

Code: Select all

```
while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 10; done& stress -c 4 -t 900s
```

(Test is "PASSED" if you do not throttle back, or exceed 79C within a 15min span. Exceeding 79C, and overheating/throttling, OR Pi3 crash indicates a "FAIL". Will also verify whether your power supply is adequate or not). A properly cooled pi3 can run this between 50C-79C.

Code: Select all

```
wget https://raw.githubusercontent.com/ssvb/cpuburn-arm/master/cpuburn-a53.S
gcc -o cpuburn-a53 cpuburn-a53.S
```

Code: Select all

`while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 10; done& ./cpuburn-a53 `

(tests stability, performs computations, if you overclock, and it is flawed, test will fail or crash. set 'gpu_mem" to 48 prior to test for optimal results). Stock Pi3 at 1.2 GHz passes this at 6 Gflops (may require a small voltage boost in /config.txt "over_voltage=1"), a stable overclocked Pi3 at 1.26 GHz passes at around 6.6 Gflops (multiple back to back tests with same Gflop result to determine stability).

Code: Select all

```
sudo apt-get install libmpich-dev
wget http://web.eece.maine.edu/~vweaver/junk/pi3_hpl.tar.gz
tar -xvzf pi3_hpl.tar.gz
chmod +x xhpl
```

Code: Select all

```
./xhpl
```

**BENCH AND TEST RESULTS:**

**Ambient 20C:**

**Sysbench**37C 114.4567s

Code: Select all

```
pi@raspberrypi:~ $ while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 10; done& sysbench --num-threads=4 --test=cpu --cpu-max-prime=20000 --validate run
[1] 1239
frequency(45)=1260002000
temp=30.0'C
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 4
Additional request validation enabled.
Doing CPU performance benchmark
Threads started!
frequency(45)=1260000000
temp=35.4'C
frequency(45)=1260000000
temp=35.4'C
frequency(45)=1260002000
temp=36.5'C
frequency(45)=1260000000
temp=36.5'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
Done.
Maximum prime number checked in CPU test: 20000
Test execution summary:
total time: 114.4567s
total number of events: 10000
total time taken by event execution: 457.7026
per-request statistics:
min: 45.42ms
avg: 45.77ms
max: 90.88ms
approx. 95 percentile: 46.32ms
Threads fairness:
events (avg/stddev): 2500.0000/12.25
execution time (avg/stddev): 114.4256/0.02
```

**Linpack**Passed Gflops 6.6

Code: Select all

```
pi@raspberrypi:~ $ ./xhpl
================================================================================
HPLinpack 2.1 -- High-Performance Linpack benchmark -- October 26, 2012
Written by A. Petitet and R. Clint Whaley, Innovative Computing Laboratory, UTK
Modified by Piotr Luszczek, Innovative Computing Laboratory, UTK
Modified by Julien Langou, University of Colorado Denver
================================================================================
An explanation of the input/output parameters follows:
T/V : Wall time / encoded variant.
N : The order of the coefficient matrix A.
NB : The partitioning blocking factor.
P : The number of process rows.
Q : The number of process columns.
Time : Time in seconds to solve the linear system.
Gflops : Rate of execution for solving the linear system.
The following parameter values will be used:
N : 8000
NB : 256
PMAP : Row-major process mapping
P : 1
Q : 1
PFACT : Left
NBMIN : 2
NDIV : 2
RFACT : Right
BCAST : 2ring
DEPTH : 0
SWAP : Mix (threshold = 64)
L1 : transposed form
U : transposed form
EQUIL : yes
ALIGN : 8 double precision words
--------------------------------------------------------------------------------
- The matrix A is randomly generated for each test.
- The following scaled residual check will be computed:
||Ax-b||_oo / ( eps * ( || x ||_oo * || A ||_oo + || b ||_oo ) * N )
- The relative machine precision (eps) is taken to be 1.110223e-16
- Computational tests pass if scaled residuals are less than 16.0
================================================================================
T/V N NB P Q Time Gflops
--------------------------------------------------------------------------------
WR02R2L2 8000 256 1 1 51.27 6.660e+00
HPL_pdgesv() start time Sun Apr 24 09:13:21 2016
HPL_pdgesv() end time Sun Apr 24 09:14:12 2016
--------------------------------------------------------------------------------
||Ax-b||_oo/(eps*(||A||_oo*||x||_oo+||b||_oo)*N)= 0.0025941 ...... PASSED
================================================================================
Finished 1 tests with the following results:
1 tests completed and passed residual checks,
0 tests completed and failed residual checks,
0 tests skipped because of illegal input values.
--------------------------------------------------------------------------------
End of Tests.
================================================================================
pi@raspberrypi:~ $ ./xhpl
================================================================================
HPLinpack 2.1 -- High-Performance Linpack benchmark -- October 26, 2012
Written by A. Petitet and R. Clint Whaley, Innovative Computing Laboratory, UTK
Modified by Piotr Luszczek, Innovative Computing Laboratory, UTK
Modified by Julien Langou, University of Colorado Denver
================================================================================
An explanation of the input/output parameters follows:
T/V : Wall time / encoded variant.
N : The order of the coefficient matrix A.
NB : The partitioning blocking factor.
P : The number of process rows.
Q : The number of process columns.
Time : Time in seconds to solve the linear system.
Gflops : Rate of execution for solving the linear system.
The following parameter values will be used:
N : 8000
NB : 256
PMAP : Row-major process mapping
P : 1
Q : 1
PFACT : Left
NBMIN : 2
NDIV : 2
RFACT : Right
BCAST : 2ring
DEPTH : 0
SWAP : Mix (threshold = 64)
L1 : transposed form
U : transposed form
EQUIL : yes
ALIGN : 8 double precision words
--------------------------------------------------------------------------------
- The matrix A is randomly generated for each test.
- The following scaled residual check will be computed:
||Ax-b||_oo / ( eps * ( || x ||_oo * || A ||_oo + || b ||_oo ) * N )
- The relative machine precision (eps) is taken to be 1.110223e-16
- Computational tests pass if scaled residuals are less than 16.0
================================================================================
T/V N NB P Q Time Gflops
--------------------------------------------------------------------------------
WR02R2L2 8000 256 1 1 51.47 6.634e+00
HPL_pdgesv() start time Sun Apr 24 09:14:53 2016
HPL_pdgesv() end time Sun Apr 24 09:15:44 2016
--------------------------------------------------------------------------------
||Ax-b||_oo/(eps*(||A||_oo*||x||_oo+||b||_oo)*N)= 0.0025941 ...... PASSED
================================================================================
Finished 1 tests with the following results:
1 tests completed and passed residual checks,
0 tests completed and failed residual checks,
0 tests skipped because of illegal input values.
--------------------------------------------------------------------------------
End of Tests.
================================================================================
pi@raspberrypi:~ $ ./xhpl
================================================================================
HPLinpack 2.1 -- High-Performance Linpack benchmark -- October 26, 2012
Written by A. Petitet and R. Clint Whaley, Innovative Computing Laboratory, UTK
Modified by Piotr Luszczek, Innovative Computing Laboratory, UTK
Modified by Julien Langou, University of Colorado Denver
================================================================================
An explanation of the input/output parameters follows:
T/V : Wall time / encoded variant.
N : The order of the coefficient matrix A.
NB : The partitioning blocking factor.
P : The number of process rows.
Q : The number of process columns.
Time : Time in seconds to solve the linear system.
Gflops : Rate of execution for solving the linear system.
The following parameter values will be used:
N : 8000
NB : 256
PMAP : Row-major process mapping
P : 1
Q : 1
PFACT : Left
NBMIN : 2
NDIV : 2
RFACT : Right
BCAST : 2ring
DEPTH : 0
SWAP : Mix (threshold = 64)
L1 : transposed form
U : transposed form
EQUIL : yes
ALIGN : 8 double precision words
--------------------------------------------------------------------------------
- The matrix A is randomly generated for each test.
- The following scaled residual check will be computed:
||Ax-b||_oo / ( eps * ( || x ||_oo * || A ||_oo + || b ||_oo ) * N )
- The relative machine precision (eps) is taken to be 1.110223e-16
- Computational tests pass if scaled residuals are less than 16.0
================================================================================
T/V N NB P Q Time Gflops
--------------------------------------------------------------------------------
WR02R2L2 8000 256 1 1 51.69 6.605e+00
HPL_pdgesv() start time Sun Apr 24 09:16:14 2016
HPL_pdgesv() end time Sun Apr 24 09:17:06 2016
--------------------------------------------------------------------------------
||Ax-b||_oo/(eps*(||A||_oo*||x||_oo+||b||_oo)*N)= 0.0025941 ...... PASSED
================================================================================
Finished 1 tests with the following results:
1 tests completed and passed residual checks,
0 tests completed and failed residual checks,
0 tests skipped because of illegal input values.
--------------------------------------------------------------------------------
End of Tests.
```

**Stress**38C

Code: Select all

```
pi@raspberrypi:~ $ while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 10; done& stress --cpu 4
[1] 2333
stress: info: [2334] dispatching hogs: 4 cpu, 0 io, 0 vm, 0 hdd
frequency(45)=1260132000
temp=30.0'C
frequency(45)=1260000000
temp=34.9'C
frequency(45)=1260002000
temp=35.4'C
frequency(45)=1260000000
temp=36.5'C
frequency(45)=1260000000
temp=36.5'C
frequency(45)=1260000000
temp=37.0'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=38.1'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=38.1'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260002000
temp=38.6'C
frequency(45)=1260000000
temp=38.1'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.0'C
frequency(45)=1260002000
temp=38.1'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=38.1'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260002000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260002000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.0'C
frequency(45)=1260000000
temp=37.0'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=38.1'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260002000
temp=38.1'C
frequency(45)=1260000000
temp=38.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=37.6'C
frequency(45)=1259998000
temp=37.6'C
frequency(45)=1260000000
temp=38.1'C
```

**Cpuburn-a53**50C

Code: Select all

```
pi@raspberrypi:~ $ while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 10; done& ./cpuburn-a53
[1] 1244
frequency(45)=1260132000
temp=27.9'C
frequency(45)=1260002000
temp=41.9'C
frequency(45)=1260000000
temp=42.9'C
frequency(45)=1260002000
temp=45.1'C
frequency(45)=1260000000
temp=46.2'C
frequency(45)=1260000000
temp=46.2'C
frequency(45)=1260000000
temp=46.2'C
frequency(45)=1260000000
temp=46.7'C
frequency(45)=1260000000
temp=46.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260002000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1259998000
temp=47.2'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260002000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1259998000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260002000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1259998000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1259998000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260002000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260002000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1259998000
temp=48.9'C
frequency(45)=1260002000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1259998000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1259998000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260002000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260002000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260002000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260002000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260002000
temp=49.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260002000
temp=50.5'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1259998000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1259998000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.2'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260002000
temp=47.2'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=47.8'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260002000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260002000
temp=49.4'C
frequency(45)=1260002000
temp=49.4'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1259998000
temp=49.4'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=48.3'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260002000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260002000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1259998000
temp=49.9'C
frequency(45)=1259998000
temp=49.9'C
frequency(45)=1260002000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260002000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=50.5'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=48.9'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.4'C
frequency(45)=1260000000
temp=49.9'C
frequency(45)=1260000000
temp=49.9'C
```

**Top**

Code: Select all

```
top - 16:23:07 up 34 min, 1 user, load average: 5.05, 5.61, 5.16
Tasks: 144 total, 5 running, 139 sleeping, 0 stopped, 0 zombie
%Cpu0 : 99.0 us, 1.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 :100.0 us, 0.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 98.7 us, 1.0 sy, 0.3 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 99.3 us, 0.7 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 948012 total, 834380 used, 113632 free, 36644 buffers
KiB Swap: 102396 total, 0 used, 102396 free. 533068 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1112 pi 20 0 1680 340 284 R 99.0 0.0 25:26.65 cpuburn-a53
1116 pi 20 0 1680 88 16 R 98.3 0.0 25:25.70 cpuburn-a53
1114 pi 20 0 1680 84 16 R 97.0 0.0 25:27.84 cpuburn-a53
1115 pi 20 0 1680 84 16 R 94.0 0.0 25:22.16 cpuburn-a53
2026 pi 20 0 628616 144016 102956 S 3.6 15.2 2:01.88 chromium-b+
656 root 20 0 120868 45204 19560 S 2.6 4.8 0:58.07 Xorg
2251 pi 20 0 376288 113548 78804 S 2.0 12.0 0:24.44 chromium-b+
882 pi 20 0 90292 23252 19640 S 1.3 2.5 0:18.04 lxpanel
1019 pi 20 0 47152 19028 16080 S 1.0 2.0 0:05.88 lxterminal
877 pi 20 0 21012 12028 9416 S 0.3 1.3 0:03.06 openbox
1110 pi 20 0 5112 2524 2148 R 0.3 0.3 0:07.52 top
2506 root 20 0 0 0 0 S 0.3 0.0 0:00.01 kworker/2:2
1 root 20 0 22884 4028 2788 S 0.0 0.4 0:06.79 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
```

**Sdbench**

Code: Select all

```
pi@raspberrypi:~ $ sudo ./sdbench.sh
[3;J
CONFIG:
CLOCK : 100.000 MHz
CORE : 500 MHz, turbo=1
DATA : 512 MB, /root/test.dat
HDPARM:
======
Timing O_DIRECT disk reads: 126 MB in 3.01 seconds = 41.86 MB/sec
Timing O_DIRECT disk reads: 124 MB in 3.03 seconds = 40.89 MB/sec
Timing O_DIRECT disk reads: 122 MB in 3.02 seconds = 40.40 MB/sec
WRITE:
=====
536870912 bytes (537 MB) copied, 25.5738 s, 21.0 MB/s
536870912 bytes (537 MB) copied, 22.3328 s, 24.0 MB/s
536870912 bytes (537 MB) copied, 23.7269 s, 22.6 MB/s
READ:
====
536870912 bytes (537 MB) copied, 12.8048 s, 41.9 MB/s
536870912 bytes (537 MB) copied, 12.3227 s, 43.6 MB/s
536870912 bytes (537 MB) copied, 12.3561 s, 43.4 MB/s
RESULT (AVG):
============
Overlay config core_freq turbo overclock_50 WRITE READ HDPARM
500 1 100.000 MHz 21.51 MB/s 40.99 MB/s 41.06 MB/s
```

**Memtester**

(example of 1 loop)

Code: Select all

```
pi@raspberrypi:~ $ memtester 700m 1
memtester version 4.3.0 (32-bit)
Copyright (C) 2001-2012 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).
pagesize is 4096
pagesizemask is 0xfffff000
want 700MB (734003200 bytes)
got 700MB (734003200 bytes), trying mlock ...locked.
Loop 1/1:
Stuck Address : ok
Random Value : ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : ok
Block Sequential : ok
Checkerboard : ok
Bit Spread : ok
Bit Flip : ok
Walking Ones : ok
Walking Zeroes : ok
8-bit Writes : ok
16-bit Writes : ok
Done.
```