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pi-tastic
Posts: 173
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Re: latest rpi-update 2.5ghz with 4B 4g

Thu Sep 19, 2019 3:23 pm

wow thanks for the update!
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akeda
Posts: 2
Joined: Fri Sep 13, 2019 1:13 pm

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

Fri Sep 20, 2019 1:44 pm

Running nicely with:

arm_freq=2000
gpu_freq=600
over_voltage=5

Peaking at 45degC with a (ridiculous) noctua fan on ( the even more ridiculous) icetower running on 3.3V.
Using the 5V pins will lower temp about 2degC.

gpu_freq=650 - the UI goes bananas
over_voltage=4 - machine will run fine, then crasch/freeze after aprox. 12h.

riccetto80
Posts: 15
Joined: Mon Aug 26, 2019 1:23 pm

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

Sat Oct 05, 2019 2:48 am

Interesting topic!

i was sure all pi4 was stable at 2.0ghz but seems from this post, is not the case!

i still have to test overclock with my pi4, i wait to receive a good metal case with 2 fans (Chinese one, "second revision" https://i.imgur.com/hjivSBx.jpg).

As general idea from what i understood, a moderate overclock of cpu and gpu, like this, will most likely run fine on any pi4, correct?

Code: Select all

over_voltage=2
arm_freq=1750
gpu_freq=600

kenkrsme
Posts: 31
Joined: Sun Jul 28, 2019 1:36 pm

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

Sat Oct 05, 2019 8:25 pm

riccetto80 wrote:
Sat Oct 05, 2019 2:48 am
Interesting topic!

i was sure all pi4 was stable at 2.0ghz but seems from this post, is not the case!

i still have to test overclock with my pi4, i wait to receive a good metal case with 2 fans (Chinese one, "second revision" https://i.imgur.com/hjivSBx.jpg).

As general idea from what i understood, a moderate overclock of cpu and gpu, like this, will most likely run fine on any pi4, correct?

Code: Select all

over_voltage=2
arm_freq=1750
gpu_freq=600
i have that case and i don't believe the fans move enough air to effectively cool the case. its probably only a degree or 2 different from the fanless version.

riccetto80
Posts: 15
Joined: Mon Aug 26, 2019 1:23 pm

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

Mon Oct 07, 2019 10:26 am

Well, i see multiple bench video online and read multiple feedback from buyers before order it and seems the 2 fans cool 4-5 degree, not just 2, more compared to the fan-less version.

this of course is not always the case, but as general idea the fan i think for sure help, to cool fast when not at 100% load and/or to reach slower the max temperature.

Also, at least first version of this particular Chinese case, the included thermal pad seems to dont be really the best choice of thickness, some user who changed the thickness seems to have much better cooling result.

I found out this "second revision" who seems to offer better thermal pads included, also for the usb and network controller not just the cpu and ram controller.

as soon i will receive it i will test it and report here!

i suggest you to check if your thermal pad really make good contact and if you can, swap for a better dimension/thickness.

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pi-tastic
Posts: 173
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Re: latest rpi-update 2.5ghz with 4B 4g

Mon Oct 07, 2019 3:43 pm

i guess tomshardware found they could get a little more from last firmware update

Code: Select all

over_voltage=6
arm_freq=2147
gpu_freq=750
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rhildinger
Posts: 39
Joined: Thu Jun 09, 2016 6:07 pm

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

Mon Oct 07, 2019 8:24 pm

Yes, the latest firmware opened up a little more overclock room. I have two boards that can overclock to 2.147GHz stable, and one that won't. I question the part about overclocking the GPU to 750 MHz though. I can set that value in config.txt and the board will boot, but "vcgencmd measure_clock core" shows that the GPU is actually only running at 500 MHz and will not ramp up under load. If I set the GPU to 600 MHz, the core speed will ramp up to 600 Mhz under load.

m][sko
Posts: 131
Joined: Fri Jul 20, 2012 6:37 am
Location: Slovakia

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

Tue Oct 15, 2019 4:45 pm

are the 2147 MHz top limit ? And why that crazy value? :)
anybody can explain it? why not 2150 or something else :)
As I can't get over 2147MHz
I did remove soc cover and I am on 40Celsius with copper heatsink
that is nice :)

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pi-tastic
Posts: 173
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Re: latest rpi-update 2.5ghz with 4B 4g

Tue Oct 15, 2019 4:52 pm

this is pretty exciting!!!
heatsink.jpg
heatsink.jpg (37.24 KiB) Viewed 3169 times
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pi-tastic
Posts: 173
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Re: latest rpi-update 2.5ghz with 4B 4g

Tue Oct 15, 2019 4:53 pm

* remove soc cover *

that is hard core, reminds me of the Pentium 4 days :)
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m][sko
Posts: 131
Joined: Fri Jul 20, 2012 6:37 am
Location: Slovakia

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

Tue Oct 15, 2019 5:08 pm

pi-tastic wrote:
Tue Oct 15, 2019 4:53 pm
* remove soc cover *

that is hard core, reminds me of the Pentium 4 days :)
it is still actual. they call it delidding
https://www.youtube.com/results?search_ ... idding+cpu

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Imperf3kt
Posts: 4005
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Location: Australia

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

Tue Oct 15, 2019 8:48 pm

m][sko wrote:
Tue Oct 15, 2019 4:45 pm
are the 2147 MHz top limit ? And why that crazy value? :)
anybody can explain it? why not 2150 or something else :)
As I can't get over 2147MHz
I did remove soc cover and I am on 40Celsius with copper heatsink
that is nice :)
You're playing a game known as "silicon lottery", googling that should answer your question.

And, at least according to a Raspberry Pi engineer earlier in the thread, the limit is 2.0GHz

Delidding and lapping generally have little to no effect for enormous risk.
That said, a Pi is "only" $35...
55:55:44:44:4C
52:4C:52:42:41

Rose coloured glasses are difficult to see through.

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pi-tastic
Posts: 173
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Re: latest rpi-update 2.5ghz with 4B 4g

Tue Oct 15, 2019 9:05 pm

35 bucks for 3ghz will be the day!!! woo!
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trejan
Posts: 2925
Joined: Tue Jul 02, 2019 2:28 pm

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

Thu Oct 17, 2019 12:31 pm

Imperf3kt wrote:
Tue Oct 15, 2019 8:48 pm
And, at least according to a Raspberry Pi engineer earlier in the thread, the limit is 2.0GHz
It was changed. The 24th Sept firmware now uses a /1 divisor for the PLL if you requested > 2GHz.
m][sko wrote: are the 2147 MHz top limit ? And why that crazy value? :)
anybody can explain it? why not 2150 or something else :)
As I can't get over 2147MHz
There are gaps in the possible values you can select because of how the 54MHz oscillator and PLL interacts.

tom_f
Posts: 3
Joined: Sat May 18, 2019 9:20 am

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

Fri Nov 01, 2019 11:37 pm

riccetto80 wrote: Also, at least first version of this particular Chinese case, the included thermal pad seems to dont be really the best choice of thickness, some user who changed the thickness seems to have much better cooling result.

I found out this "second revision" who seems to offer better thermal pads included, also for the usb and network controller not just the cpu and ram controller.

as soon i will receive it i will test it and report here!

i suggest you to check if your thermal pad really make good contact and if you can, swap for a better dimension/thickness.
I also purchased that case and have just been benchmarking it tonight with my RPi4B 4GB.

I actually replaced the thermal pad for the cpu altogether, with a copper shim and arctic silver thermal compound. Because the case screws together, the shim is kept firmly in place and there is good contact between the cpu and the heatsink. Going from the thermal pads to the copper shim + thermal compound, I saw my temperatures drop from mid 60s to mid 40s degrees celsius, running sysbench with 4 threads on the cpu test, at 1750MHz and overvoltage at 2. At idle, it runs at 37 degrees. I'll try and test at 2GHz and see how that affects things.

I don't know how that compares with other people's results, but the change I saw going from the included thermal pads to more conventional cooling materials was very significant.

[update]

I tested it at 2.0GHz yesterday, after the application of another copper shim in the PCB area around the LPDDR4 memory chip, ethernet and usb controller, on top of a thermal pad. Current temperatures when running the same sysbench load hover between 55-56 degrees, which I'm quite happy with, given that most videos on the internet demonstrating similar performance use either the expensive noctua fans or even more expensive tower cooler, both of which are substantially more noisy and bulky and additionally leave you with difficulty and added expense of finding a case that will accommodate them.

For reference, these are roughly the locations where I placed the shims:
raspberrypi4_board_shims.png
raspberrypi4_board_shims.png (118.41 KiB) Viewed 2722 times
To be clear, the one above the memory chip and next to the power socket are on top of non-conductive thermal pads, do not place shims anywhere they can make contact with metallic components on the board!
Last edited by tom_f on Sun Nov 03, 2019 3:57 pm, edited 3 times in total.

FPSychotic
Posts: 22
Joined: Thu Jul 11, 2019 6:21 pm

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

Sat Nov 02, 2019 8:38 pm

im running 2.0ghz from long time ago and the effective clock is 2.Ghz. Temperature cannot rise from 73C making the CPU stress test by hours. So I think that depend of the silicion, some can go higher.

riccetto80
Posts: 15
Joined: Mon Aug 26, 2019 1:23 pm

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

Tue Nov 05, 2019 8:47 am

tom_f wrote:
Fri Nov 01, 2019 11:37 pm
I also purchased that case and have just been benchmarking it tonight with my RPi4B 4GB.

I actually replaced the thermal pad for the cpu altogether, with a copper shim and arctic silver thermal compound. Because the case screws together, the shim is kept firmly in place and there is good contact between the cpu and the heatsink. Going from the thermal pads to the copper shim + thermal compound, I saw my temperatures drop from mid 60s to mid 40s degrees celsius, running sysbench with 4 threads on the cpu test, at 1750MHz and overvoltage at 2. At idle, it runs at 37 degrees. I'll try and test at 2GHz and see how that affects things.

I don't know how that compares with other people's results, but the change I saw going from the included thermal pads to more conventional cooling materials was very significant.

[update]

I tested it at 2.0GHz yesterday, after the application of another copper shim in the PCB area around the LPDDR4 memory chip, ethernet and usb controller, on top of a thermal pad. Current temperatures when running the same sysbench load hover between 55-56 degrees, which I'm quite happy with, given that most videos on the internet demonstrating similar performance use either the expensive noctua fans or even more expensive tower cooler, both of which are substantially more noisy and bulky and additionally leave you with difficulty and added expense of finding a case that will accommodate them.

For reference, these are roughly the locations where I placed the shims:

raspberrypi4_board_shims.png

To be clear, the one above the memory chip and next to the power socket are on top of non-conductive thermal pads, do not place shims anywhere they can make contact with metallic components on the board!
this is my test, with included thermal pad, overclocked to 1750:

Image

i used this test script: https://www.youtube.com/watch?v=e6mWIms ... u.be&t=140

what thickness did you used on your copper shim?

EDIT: i realized i attacked the wrong image!!! temperature are 6-8 degree lower with this case! i attached the correct image.
Last edited by riccetto80 on Thu Nov 07, 2019 1:27 pm, edited 1 time in total.

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5t4n5
Posts: 37
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Location: Near a beach in Devon
Contact: Website Twitter

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

Tue Nov 05, 2019 12:05 pm

arm_freq=2000
gpu_freq=600
over_voltage=4

Running sysbench:

temp=30.0'C
temp=34.0'C
frequency(48)=2000478464
temp=34.0'C
frequency(48)=2000478464
temp=36.0'C
frequency(48)=2000478464
temp=37.0'C
frequency(48)=2000478464
temp=36.0'C
frequency(48)=2000531200
temp=37.0'C
frequency(48)=2000478464
temp=38.0'C
frequency(48)=2000478464
temp=37.0'C
frequency(48)=2000478464
temp=39.0'C
frequency(48)=2000478464
temp=37.0'C
frequency(48)=2000531200
temp=37.0'C
frequency(48)=2000531200
temp=37.0'C
frequency(48)=2000478464
temp=37.0'C
frequency(48)=2000478464
temp=38.0'C
frequency(48)=2000531200
Honestly, i've no idea what i'm doing. :oops:

tom_f
Posts: 3
Joined: Sat May 18, 2019 9:20 am

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

Wed Nov 06, 2019 9:01 pm

what thickness did you used on your copper shim?
I can't tell you exactly, as I purchased a pack of 15x15mm shims with 8 different thicknesses, ranging from 0.3mm to 2.0mm, (which you can find here: https://www.amazon.co.uk/gp/product/B00 ... UTF8&psc=1) and just tried one after other till I found one that fit quite well.

I know the thinnest shim (0.3mm) wasn't thick enough and the thicker ones were far too thick, so at a guess, it was probably the 0.8mm one or 1.0mm one. I actually ended up filing the one used above the cpu heat spreader a little bit, till I could grip the two parts of the case with the board and shim sandwiched in between, without the shim sliding around when I turned the case over. If you end up filing some shims down, make sure you wipe the copper dust off carefully, as you don't want any of that stuff getting on your board.

riccetto80
Posts: 15
Joined: Mon Aug 26, 2019 1:23 pm

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

Wed Nov 06, 2019 9:49 pm

understand, thank you for info, i will try to find a set with different thickness like yours!

i realized i attached wrong image, with different case.

with thermal pad included i have similar result, considering you run the test at 2.000 i tun at 1.750, so after all i think i will keep the thermal pad.

maybe im lucky and my pi4 cpu overheat less?

did you tested with included thermal pads before use the copper and thermal paste?

verknxt_minecraft
Posts: 3
Joined: Fri Feb 07, 2020 3:10 pm

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

Fri Feb 28, 2020 2:01 pm

with the latest raspbian noobs it seems like i can put any number? now i have 2180 overclock for arm and 800 for gpu and it really feels smoother any way to confirm it? :) https://yadi.sk/d/1dyCY3iN1ViKCQ

pica200
Posts: 219
Joined: Tue Aug 06, 2019 10:27 am

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

Fri Feb 28, 2020 2:26 pm

I don't know about arm_freq but all GPU clocks except core are not limited anymore. See this and other posts on this closed issue:

https://github.com/raspberrypi/firmware ... -582425626

Be careful because the GPU is sometimes not as stable as it seems. It will start freezing randomly for a few seconds when it's unstable (test with full GPU load if possible).

verknxt_minecraft
Posts: 3
Joined: Fri Feb 07, 2020 3:10 pm

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

Sat Feb 29, 2020 1:33 pm

pica200 wrote:
Fri Feb 28, 2020 2:26 pm
I don't know about arm_freq but all GPU clocks except core are not limited anymore. See this and other posts on this closed issue:

https://github.com/raspberrypi/firmware ... -582425626

Be careful because the GPU is sometimes not as stable as it seems. It will start freezing randomly for a few seconds when it's unstable (test with full GPU load if possible).
it's actually stable i did a test for 4-5 hours and it didn't crashed or hang i love the pi😍

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