dominic03
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Pi4 Overclocking question

Tue Apr 13, 2021 1:43 pm

So I've heard that people are overclocking their Pi's even higher than before (2.3ghz, 2.5ghz?!?). My question is: Was the 2147MHz limit removed? Can I overclock to 2.2GHz or 2.3GHz now (with a high enough over-voltage and good silicon)?
And what about GPU overclocking?
I also heard the 8GB Pi4 has an advantage with overclocking. Is this true? I have a 4GB Pi4.

What overclocks are you able to achieve?
RPi 4B 4gb dual-booting ARM32/64 Raspberry Pi OS (via PINN)
SanDisk ImageMate 64gb 100mb/s C10/U1 microSD
- Currently transitioning from 32gb to 64gb card
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Overclocked to 2.1GHz
Active cooling (max temp ~70°)

aBUGSworstnightmare
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Re: Pi4 Overclocking question

Wed Apr 14, 2021 4:32 pm

There are several threats here in the forum which have details on Pi4 / CM4 and Pi400 overclocking.

Silicon lottery for sure!

dominic03
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Re: Pi4 Overclocking question

Wed Apr 14, 2021 4:46 pm

aBUGSworstnightmare wrote:
Wed Apr 14, 2021 4:32 pm
There are several threats here in the forum which have details on Pi4 / CM4 and Pi400 overclocking.

Silicon lottery for sure!
Can you link me some? I've tried searching Google but most threads are outdated and have instructions for the 2.147GHz.
RPi 4B 4gb dual-booting ARM32/64 Raspberry Pi OS (via PINN)
SanDisk ImageMate 64gb 100mb/s C10/U1 microSD
- Currently transitioning from 32gb to 64gb card
Sceptre E225W 22" 75hz 1080p monitor
Overclocked to 2.1GHz
Active cooling (max temp ~70°)

dominic03
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Re: Pi4 Overclocking question

Thu Apr 15, 2021 12:25 am

dominic03 wrote:
Wed Apr 14, 2021 4:46 pm
aBUGSworstnightmare wrote:
Wed Apr 14, 2021 4:32 pm
There are several threats here in the forum which have details on Pi4 / CM4 and Pi400 overclocking.

Silicon lottery for sure!
Can you link me some? I've tried searching Google but most threads are outdated and have instructions for the 2.147GHz.
So here's a basic idea of what I need to do-
1. Update the firmware? (rpi-update or apt update)
2. Set arm_freq=2300 or 2200
3. over_voltage=8
4. force_turbo=1 (voids "warranty")

Is this right?
RPi 4B 4gb dual-booting ARM32/64 Raspberry Pi OS (via PINN)
SanDisk ImageMate 64gb 100mb/s C10/U1 microSD
- Currently transitioning from 32gb to 64gb card
Sceptre E225W 22" 75hz 1080p monitor
Overclocked to 2.1GHz
Active cooling (max temp ~70°)

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Imperf3kt
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Re: Pi4 Overclocking question

Thu Apr 15, 2021 12:58 am

dominic03 wrote:
Thu Apr 15, 2021 12:25 am
4. force_turbo=1 (voids "warranty")
Force_turbo isn't necessary, and the Pi4b does not include the "warranty bit"

I'd also start with a lower over voltage, maybe 2 or 4
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kerry_s
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Re: Pi4 Overclocking question

Thu Apr 15, 2021 1:38 am

if it won't boot, hold/press the shift key while booting to by pass config.

aBUGSworstnightmare
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Re: Pi4 Overclocking question

Thu Apr 15, 2021 5:04 am

As said, start with lower settings, run a stress test and if your Pi is stable increase your settings and retest. Repeat until you found a range where your Pi is still stable.
Let me point you to some articles on overclocking:

https://www.jeffgeerling.com/blog/2020/ ... ked-22-ghz
https://www.jeffgeerling.com/blog/2020/ ... e-module-4

You will also find some settings of some lucky dudes from the silicon lottery.
If you want to use a Pi which is oberclocked beyond 2GHz you will need additional cooling to prevent it from throttling.

dominic03
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Re: Pi4 Overclocking question

Thu Apr 15, 2021 11:15 am

Imperf3kt wrote:
Thu Apr 15, 2021 12:58 am
dominic03 wrote:
Thu Apr 15, 2021 12:25 am
4. force_turbo=1 (voids "warranty")
Force_turbo isn't necessary, and the Pi4b does not include the "warranty bit"

I'd also start with a lower over voltage, maybe 2 or 4
It's still needed to get an over_voltage higher than 8. I'm currently at 2147MHz with over_voltage=6 so for best results I would need to increase it

I've heard rumors of the warranty bit not being set, hence putting "warranty" in quotes. Either way, I'm probably not in warranty anymore (how long does it last?) so it doesn't matter too much anyway.
RPi 4B 4gb dual-booting ARM32/64 Raspberry Pi OS (via PINN)
SanDisk ImageMate 64gb 100mb/s C10/U1 microSD
- Currently transitioning from 32gb to 64gb card
Sceptre E225W 22" 75hz 1080p monitor
Overclocked to 2.1GHz
Active cooling (max temp ~70°)

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Imperf3kt
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Re: Pi4 Overclocking question

Thu Apr 15, 2021 8:30 pm

My point was that you very likely do not want an overvolt that high. If you can run stably at a lower overvolt, then there is no need to increase it, if it doesn't run stably, increase it a little bit, but also expect that it may simply never run stably at the clock speed you are trying.

The idea is to find the minimum overvolt your Pi will reliably work at as higher overvolt settings are undesirable.
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dominic03
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Re: Pi4 Overclocking question

Mon Apr 19, 2021 3:50 pm

Thanks for your help everyone. I got my Pi to work at 2250MHz, but it would get too hot during CPUburn and would crash when I ran some apps (like Minecraft).So I'll stick with 2100MHz for now.

Now, what about GPU overclocking? Can you go above 750 now?
RPi 4B 4gb dual-booting ARM32/64 Raspberry Pi OS (via PINN)
SanDisk ImageMate 64gb 100mb/s C10/U1 microSD
- Currently transitioning from 32gb to 64gb card
Sceptre E225W 22" 75hz 1080p monitor
Overclocked to 2.1GHz
Active cooling (max temp ~70°)

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

Re: Pi4 Overclocking question

Mon Apr 19, 2021 4:43 pm

dominic03 wrote:
Mon Apr 19, 2021 3:50 pm
Thanks for your help everyone. I got my Pi to work at 2250MHz, but it would get too hot during CPUburn and would crash when I ran some apps (like Minecraft).So I'll stick with 2100MHz for now.

Now, what about GPU overclocking? Can you go above 750 now?
cooling is the key! My CM4 with Geekworm heatsink and a 120mm fan runs no hotter than 45°C at 2GHz.
Had good results when placing the RPI4 in an armour case.

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jahboater
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Re: Pi4 Overclocking question

Mon Apr 19, 2021 5:01 pm

aBUGSworstnightmare wrote:
Mon Apr 19, 2021 4:43 pm
Had good results when placing the RPI4 in an armour case.
Assuming you mean:
https://thepihut.com/products/aluminium ... berry-pi-4
then I agree. A very effective heat sink case.
With this case you can use a TIM paste rather than "thermal" tape.
My Pi4 runs happily at 2.1GHz without coming close to throttling using this case.
And it comes in a choice of nice colours!
(but black is probably the best for cooling).

aBUGSworstnightmare
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Re: Pi4 Overclocking question

Tue Apr 20, 2021 4:50 am

jahboater wrote:
Mon Apr 19, 2021 5:01 pm
aBUGSworstnightmare wrote:
Mon Apr 19, 2021 4:43 pm
Had good results when placing the RPI4 in an armour case.
Assuming you mean:
https://thepihut.com/products/aluminium ... berry-pi-4
then I agree. A very effective heat sink case.
With this case you can use a TIM paste rather than "thermal" tape.
My Pi4 runs happily at 2.1GHz without coming close to throttling using this case.
And it comes in a choice of nice colours!
(but black is probably the best for cooling).
yes! Protects the board (armour) and is quite effective.

cleverca22
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Re: Pi4 Overclocking question

Tue Apr 20, 2021 5:23 am

aBUGSworstnightmare wrote:
Mon Apr 19, 2021 4:43 pm
dominic03 wrote:
Mon Apr 19, 2021 3:50 pm
Thanks for your help everyone. I got my Pi to work at 2250MHz, but it would get too hot during CPUburn and would crash when I ran some apps (like Minecraft).So I'll stick with 2100MHz for now.

Now, what about GPU overclocking? Can you go above 750 now?
cooling is the key! My CM4 with Geekworm heatsink and a 120mm fan runs no hotter than 45°C at 2GHz.
Had good results when placing the RPI4 in an armour case.
i have also seen reports that both the pi400 and the CM4 are using the C0 stepping of the chip, which has much lower waste heat production
and the pi400 can be overclocked pretty hard, thanks to its massive passive heatsink

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cr_chsn1
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Re: Pi4 Overclocking question

Thu May 06, 2021 11:31 am

2500 MHz is the current limit due to the max. frequency of the PLLB.
The BCM2711B0 (RPi4B) can be pushed with with a little bit of extra cooling to that limit, the BCM2711C0 on the CM4s just do it.

In February I opend a issue ath the GitHub-repository.
https://github.com/raspberrypi/firmware/issues/1537

Maybe in a future firmware-release this limit will be raised. No limit at all or a config-setting would be really nice.
Especially for the C0, I would like to see them at 3 GHz. It's a great piece of silicon with good potential.

I keep my fingers crossed.
RASPICED - Raspberry Pi Overclocking
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cleverca22
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Re: Pi4 Overclocking question

Thu May 06, 2021 4:17 pm

Code: Select all

root@pi400:/sys/devices/system/cpu/cpufreq/policy0# echo performance > scaling_governor 
root@pi400:/sys/devices/system/cpu/cpufreq/policy0# vcgencmd measure_clock pllb
frequency(100)=3599999744
root@pi400:/sys/devices/system/cpu/cpufreq/policy0# vcgencmd measure_clock arm
frequency(48)=1800457088
root@pi400:/sys/devices/system/cpu/cpufreq/policy0# 
without any overclocking, when i set my pi400 to 1.8ghz, it configures PLLB to 3.6ghz, and then runs the arm from PLLB/2

in theory, you could just change the divisor to /1, and then use only the PLLB controls to set the clock, giving you up to 3.6ghz

obviously, no guarantee the arm core will work at that speed

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cr_chsn1
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Re: Pi4 Overclocking question

Thu May 06, 2021 6:10 pm

If you or somebody else know where to change this setting, the beer's on me.
Current max. PLLB is 5.0 GHz, so if the divider is 1 you should have room to play.
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thatchunkylad198966
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Re: Pi4 Overclocking question

Tue May 11, 2021 9:44 am

Imperf3kt wrote:
Thu Apr 15, 2021 12:58 am
dominic03 wrote:
Thu Apr 15, 2021 12:25 am
4. force_turbo=1 (voids "warranty")
Force_turbo isn't necessary, and the Pi4b does not include the "warranty bit"

I'd also start with a lower over voltage, maybe 2 or 4
"force_turbo=1" IS necessary if you want more than over voltage 6.
And yes, it does void warranty.
A member of the RPi foundation confirmed this.

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Imperf3kt
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Re: Pi4 Overclocking question

Tue May 11, 2021 12:57 pm

thatchunkylad198966 wrote:
Tue May 11, 2021 9:44 am
Imperf3kt wrote:
Thu Apr 15, 2021 12:58 am
dominic03 wrote:
Thu Apr 15, 2021 12:25 am
4. force_turbo=1 (voids "warranty")
Force_turbo isn't necessary, and the Pi4b does not include the "warranty bit"

I'd also start with a lower over voltage, maybe 2 or 4
"force_turbo=1" IS necessary if you want more than over voltage 6.
And yes, it does void warranty.
A member of the RPi foundation confirmed this.
You are correct, if you want to over volt beyond 6, force_turbo will be required. I should have been a little clearer and started that such an overclock in itself is what wasn't necessary.
However the "warranty bit" that tracks if these two conditions are met, does not exist on a Pi4b, engineers have confirmed this also.
Last edited by Imperf3kt on Tue May 11, 2021 9:07 pm, edited 1 time in total.
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ejolson
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Re: Pi4 Overclocking question

Tue May 11, 2021 2:16 pm

jahboater wrote:
Mon Apr 19, 2021 5:01 pm
aBUGSworstnightmare wrote:
Mon Apr 19, 2021 4:43 pm
Had good results when placing the RPI4 in an armour case.
Assuming you mean:
https://thepihut.com/products/aluminium ... berry-pi-4
then I agree. A very effective heat sink case.
With this case you can use a TIM paste rather than "thermal" tape.
My Pi4 runs happily at 2.1GHz without coming close to throttling using this case.
And it comes in a choice of nice colours!
(but black is probably the best for cooling).
I've remember a review that this heat sink does not come in contact with the USB3 chip and due to the restricted airflow can cause that chip to overheat. Can you verify whether the USB3 chip is cooled and if not whether there is a solution for this. The application would be a heavily loaded file server with an SSD.

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jahboater
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Re: Pi4 Overclocking question

Tue May 11, 2021 2:30 pm

ejolson wrote:
Tue May 11, 2021 2:16 pm
I've remember a review that this heat sink does not come in contact with the USB3 chip and due to the restricted airflow can cause that chip to overheat. Can you verify whether the USB3 chip is cooled and if not whether there is a solution for this. The application would be a heavily loaded file server with an SSD.
Sorry I'd rather not take the case apart.
It was assembled very carefully with a "liquid metal" thermal paste with a conductivity of 73 W/(m·K) or similar.
These high performance "pastes" are electrically conductive, and liquid, so must be used with caution.
I remember there were multiple contact pads (three ?).

I don't use the USB much, so cant comment about that.
The SoC remains cool under any workload I can give it.

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cr_chsn1
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Re: Pi4 Overclocking question

Tue May 11, 2021 4:36 pm

thatchunkylad198966 wrote:
Tue May 11, 2021 9:44 am
"force_turbo=1" IS necessary if you want more than over voltage 6.
And yes, it does void warranty.
A member of the RPi foundation confirmed this.
The warranty bit isn't set any more on RPi4.

https://www.raspberrypi.org/documentati ... /README.md
https://github.com/raspberrypi/document ... -826745741
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