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pi-tastic
Posts: 84
Joined: Mon Jul 29, 2019 6:34 pm

latest rpi-update 2.5ghz with 4B 4g

Thu Sep 12, 2019 4:33 pm

Screenshot from 2019-09-12 12-30-31.png
Screenshot from 2019-09-12 12-30-31.png (13.12 KiB) Viewed 697 times
Screenshot from 2019-09-12 12-30-17.png
Screenshot from 2019-09-12 12-30-17.png (12.42 KiB) Viewed 697 times
Screenshot from 2019-09-12 12-30-04.png
Screenshot from 2019-09-12 12-30-04.png (31.08 KiB) Viewed 697 times
its for sure making more heat however i have that under control lol
heatsinks and a blower!
maccaps.com - bringing life to dead electronics.

graphicw
Posts: 30
Joined: Mon Sep 09, 2019 5:04 pm

Re: latest rpi-update 2.5ghz with 4B 4g

Thu Sep 12, 2019 9:51 pm

Please do me a favor and test it with CPU Burn and let us know how it performs. If you stay under 80 C then it will very interesting to see what you set up for cooling.

Moonmarch
Posts: 117
Joined: Thu Mar 07, 2019 1:34 am

Re: latest rpi-update 2.5ghz with 4B 4g

Fri Sep 13, 2019 9:09 am

I have already seen several videos about overclocking the RPI4, 1 GHz overclock on the RPI4 that has to be a new record for any RPI computer, the RPI3b+ would be able to overclock to 1.6 GHz any higher clock speeds would prevent the computer from booting, the real test is using the computer with the overclock parameters to see if the computer freezes or programs crash frequently which would prevent the computer from being usable when I overclocked the RPI3b+ to certain CPU speeds Chromium would crash all the time, overclocking the GPU to certain speeds will cause graphic artifacts.

sparkyhall
Posts: 130
Joined: Mon Aug 27, 2012 9:14 am

Re: latest rpi-update 2.5ghz with 4B 4g

Fri Sep 13, 2019 11:58 am

I suspect you are overloading the PMIC overclocking this high. The PMIC is a MxL7704 and the main out is rated to 4A, at 1V that's only 4W. When I ran my Pi4 at 2GHz the 5V supply current went from 1A at 100% CPU load to 1.5A, an increase of 2.5W. At a guess at 2.5GHz you are likely to have increased the input power by nearly 5W. I would be careful running stress tests for too long at this frequency.

akeda
Posts: 1
Joined: Fri Sep 13, 2019 1:13 pm

Re: latest rpi-update 2.5ghz with 4B 4g

Fri Sep 13, 2019 1:28 pm

Having read this thread, and believing clocking past 2GHz wasn't currently possible, I tested this yesterday.

Using the config.txt settings above,

vcgencmd measure_clock arm

shows a clockspeed of roughly 700MHz while running a stress script, while the /sys/devices...etc. method shows 2500MHz. The script takes forever, so the vcgencmd number seems to be more reliable. Same script at 2GHz is a lot faster...

The temperature in the above example also seems on the low side.

To sum it up: I believe the ARM is most probably running at 700MHz when setting i to 2500.

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pi-tastic
Posts: 84
Joined: Mon Jul 29, 2019 6:34 pm

Re: latest rpi-update 2.5ghz with 4B 4g

Fri Sep 13, 2019 5:41 pm

oh golly your right:

frequency(48)=705164032 @ 2500
frequency(48)=1722251904 @ 2000
frequency(48)=1750412160 @ 1750

lol it appears its fastest @ 1750 lol.
maccaps.com - bringing life to dead electronics.


graphicw
Posts: 30
Joined: Mon Sep 09, 2019 5:04 pm

Re: latest rpi-update 2.5ghz with 4B 4g

Sat Sep 14, 2019 5:47 am

I kind of figured it did not actually do 2.5 GHz. RPI happily chugs along up to 2 GHz with proper cooling. I run mine at 1.8 GHz because I shoot for an overclock that does not throttle with CPU Burn and my current cooling solutions in use. Once I have to bump over voltage to 4 or 6, the CPU still reaches throttle temp after a few minutes of running CPU Burn. This is with fan and heatsink. I get up to 1.8 GHz CPU and GPU of 600 MHz with over voltage set to only 2. That allows me stay under 70 C even in CPU Burn running for hours. I find CPU Burn to be the best tool around. You will never run that hard of a workload in a real world situation unless you are going NEON hardcore.

FPSychotic
Posts: 18
Joined: Thu Jul 11, 2019 6:21 pm

Re: latest rpi-update 2.5ghz with 4B 4g

Sun Sep 15, 2019 1:54 pm

i'm running rpi4 4gb at 2Ghz at constant 73C without issues. aluminium case with doube fan and SSD

kenkrsme
Posts: 12
Joined: Sun Jul 28, 2019 1:36 pm

Re: latest rpi-update 2.5ghz with 4B 4g

Sun Sep 15, 2019 2:04 pm

graphicw wrote:
Sat Sep 14, 2019 5:47 am
I kind of figured it did not actually do 2.5 GHz. RPI happily chugs along up to 2 GHz with proper cooling. I run mine at 1.8 GHz because I shoot for an overclock that does not throttle with CPU Burn and my current cooling solutions in use. Once I have to bump over voltage to 4 or 6, the CPU still reaches throttle temp after a few minutes of running CPU Burn. This is with fan and heatsink. I get up to 1.8 GHz CPU and GPU of 600 MHz with over voltage set to only 2. That allows me stay under 70 C even in CPU Burn running for hours. I find CPU Burn to be the best tool around. You will never run that hard of a workload in a real world situation unless you are going NEON hardcore.
mine wont boot at 2.2 and is extremely unstable at 2.1. 2.0 is stable but wont cpuburn without freaking out. i run at 2.0, doesnt seem to effect my daily use.


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