User avatar
Gavinmc42
Posts: 6309
Joined: Wed Aug 28, 2013 3:31 am

Re: Maximum stable overclocking speed of a Pi 4 or 400

Mon Jun 21, 2021 8:41 am

The Cm4 doesn't have the size of the Pi4, and cannot cool as effectively, so you might need extra cooling.
To get anything close to a standard heatsink for CM4 testing, something like this?
https://www.waveshare.com/catalogsearch ... 4+heatsink

The Pi4 did a pretty good job spreading the heat to anything metal like the connectors.
The Pi400 is on another level, mine runs about 20C cooler than my Pi4's and that at 1800 compared to 1500.
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges

thatchunkylad198966
Posts: 592
Joined: Thu Jul 04, 2019 10:21 am
Location: UK, Birmingham

Re: Maximum stable overclocking speed of a Pi 4 or 400

Mon Jun 21, 2021 9:02 am

So, I just been testing and...

2200 can boot to the desktop without an over_voltage.
2225 crashes until over_voltage 8.

And now I'm at 2300 with an overvolt of 10. anything higher and can't boot to the desktop.

Going to compile a kernel now and see what happens.

Is it recommended to go up by .25? so, 2200, 2225?
[NEW] Ubuntu - CM4/RPi4B custom image(s)! XFCE4, LXQt, i3-WM, WireGuard, Samba, Kodi, Latest MESA graphics drivers!

Code: Select all

https://www.raspberrypi.org/forums/viewtopic.php?f=131&t=314419

thatchunkylad198966
Posts: 592
Joined: Thu Jul 04, 2019 10:21 am
Location: UK, Birmingham

Re: Maximum stable overclocking speed of a Pi 4 or 400

Mon Jun 21, 2021 11:11 am

Compiled 5.12.10 kernel and didn't crash.
I tried over_voltage 8/10/12/15 at 2300 and it kept on crashing when starting the compile. it did boot to the desktop.
I'm at 2200, over_voltage 8 and 750 gpu, compiled a kernel that just took over an hour an half.

2200 with NO over_voltage booted to the DE but crashed as soon as I started the compile.
[NEW] Ubuntu - CM4/RPi4B custom image(s)! XFCE4, LXQt, i3-WM, WireGuard, Samba, Kodi, Latest MESA graphics drivers!

Code: Select all

https://www.raspberrypi.org/forums/viewtopic.php?f=131&t=314419

aBUGSworstnightmare
Posts: 3890
Joined: Tue Jun 30, 2015 1:35 pm

Re: Maximum stable overclocking speed of a Pi 4 or 400

Tue Jun 22, 2021 6:12 am

jamesh wrote:
Mon Jun 21, 2021 7:46 am
The Cm4 doesn't have the size of the Pi4, and cannot cool as effectively, so you might need extra cooling.
for CM4 cooling I will keep recommending Geekworm C235 heatsink.
I'm using them on some test jigs with different fan setups; running a full kernel compile at 2GHz overclocked will never exceed 45°C on them (note: a Pi4 in an armour case will reach more than 80°C when there is no fan around).

Image
120mm fan used to pull air away from CM4+CM4IO

Image
milled a small adapter plate which allows mounting a good (!, 9,34 m3/h @ 12.3dbA, 12V 40x40x20mm) fan. Also pulling air away for best convection

thatchunkylad198966
Posts: 592
Joined: Thu Jul 04, 2019 10:21 am
Location: UK, Birmingham

Re: Maximum stable overclocking speed of a Pi 4 or 400

Tue Jun 22, 2021 10:07 am

@aBUGSworstnightmare: Nice fan, where did you get it? I'm using a PC case fan sat on-top of the waveshare case. right now I have FireFox open and 41c. Under full-load it's about 75c.
[NEW] Ubuntu - CM4/RPi4B custom image(s)! XFCE4, LXQt, i3-WM, WireGuard, Samba, Kodi, Latest MESA graphics drivers!

Code: Select all

https://www.raspberrypi.org/forums/viewtopic.php?f=131&t=314419

aBUGSworstnightmare
Posts: 3890
Joined: Tue Jun 30, 2015 1:35 pm

Re: Maximum stable overclocking speed of a Pi 4 or 400

Wed Jun 23, 2021 9:12 am

thatchunkylad198966 wrote:
Tue Jun 22, 2021 10:07 am
@aBUGSworstnightmare: Nice fan, where did you get it? I'm using a PC case fan sat on-top of the waveshare case. right now I have FireFox open and 41c. Under full-load it's about 75c.
which fan do you speak of? The 120mm or the 40mm?

The 40x40x20mm is a SUNON HA40201V41000UA99,, 12 V- version. see here for the spec sheet: https://www.pollin.de/productdownloads/D320528D.PDF
You can buy it for less than 3EUR here https://www.pollin.de/p/axialluefter-su ... 2-v-320528

I've milled an adapter plate from GFK which allows for mounting in on top of the CM4 heat sink (use small M2.5 standoffs).
IMG_20210523_135207.jpg
IMG_20210523_135207.jpg (108.38 KiB) Viewed 591 times
IMG_20210523_135156.jpg
IMG_20210523_135156.jpg (122.86 KiB) Viewed 591 times
IMG_20210521_145744.jpg
IMG_20210521_145744.jpg (58.74 KiB) Viewed 591 times
The 120mm is a A1225M12S, 120x120x25, 12V, 3W, with green LED illumination. 9 blades, 33 CFM , 0,93 m³/min.
It has the same performance as the small one.

Return to “Advanced users”