Looking for Pi 3 B+ overclock Settings

[TimB101]

Hi Imperf3kt

Please re-read my post.

I'm injecting power via the GPIO pins which bypasses the polyfuse, it's impossible to get my overclock with power in via the (bloody awful) USB B micro socket.

Logic is rated to at least 5.4v and I'm only giving it 5.35v which falls to 5.25v under load

Don't worry about my Pi

[TimB101]

OK will try at stock speeds and see...

I put the vcore/throttle in the wrong way round in the script, just corrected that. Much tidier

[TimB101]

Hi again jahboater

Nope, it didn't like it at stock settings either.

Crashes just the same.

I should point out I have a swapfile of 4096mb, as I'm running from a 64gb card I have the space....
Does that affect the test?

[jahboater]

Hi again jahboater

Nope, it didn't like it at stock settings either.

Crashes just the same.

That's not good.
Sorry I don't know whats wrong with the Pi.

I should point out I have a swapfile of 4096mb, as I'm running from a 64gb card I have the space....
Does that affect the test?

I don't see why. Memtester is a well used program from the Debian repository. It never failed on any of my Pi's at stock speeds. 64GB is nothing (it can handle up to 1 exbibyte (EiB)). 4GB of swap is a lot and probably unnecessary.

[davidcoton]

I'm injecting power via the GPIO pins which bypasses the polyfuse, it's impossible to get my overclock with power in via the (bloody awful) USB B micro socket.

That is a bad idea. Most times the microUSB socket is not a problem, are you sure your cable to microUSB is adequate (18AWG wires for preference)?
With the polyfuse bypassed and excess voltage applied you are well into Pi Abuse territory.
Also, increasing the supply voltage will not improve the Pi's performance, since the SOC has on-board regulators to lower voltages for almost everything.
2.7A is well above what the Pi should draw -- do you have any peripherals drawing 5V through the Pi? If the Pi itself is using almost 14.5W, the temperatures are absolutely amazing.

Don't worry about my Pi

Based on what you have said, worry about your Pi's health is fully justified.

[bensimmo]

Why do you need such a high voltage, the regulators drop all of it to power everything anyway?
The CPU speed shouldn't alter that?

The USB socket is my larger drop on the system, 0.1V iirc, cables for me regarding fine.

An alternative is to solder direct to the PP pins before the fuse,.if you want to use it

[marcosbong]

Hello. I know this is not a overclocking question, but I'm sure you're the ones who bettercknow about this subject
I've just changed to a Rpi 3B+ from a Rpi2.
I've just pulled out my 64gb SD from Rpi2 and plugged into Rpi3.
Should I change something in /boot/config.txt ?
Everything seems to be OK. In Conky frecs goes from 0.6 to 1.4 ghz.
Thanks in advance

[bensimmo]

That seems fine, as long as there are no overclock settings.from the Pi2, which I guess there are not as it would be limited to 1GHz. (You can put them

Code: Select all

[pi2]
overclock settings....
...
...
[all]

If you do want to use in the Pi2 and use it at 1GHz.and switch between that and the Pi3B+


You're getting the correct range there though, idle to full speed.
It may drop to 1.2GHz if the CPU start to get above 60C.

[jahboater]

It may drop to 1.2GHz if the CPU start to get above 60C.

You can change that limit to 70C with:

temp_soft_limit=70

[marcosbong]

It may drop to 1.2GHz if the CPU start to get above 60C.

You can change that limit to 70C with:

temp_soft_limit=70

I'll let it throttle at 60C.
60's are reached quite easy without a heatsink, and that means that 70's will be hited with moderate heavy loads. And 70's are not good for SoC's health, IMHO
Waiting for a geeekpi armor to arrive

[jahboater]

I'll let it throttle at 60C.
60's are reached quite easy without a heatsink, and that means that 70's will be hited with moderate heavy loads. And 70's are not good for SoC's health, IMHO

My 3B+ with heat sink runs at 1.4GHz all the time - regardless of how heavy the load is.
When the load is large and runs for a long time is when you need all the GHz you can get!
The 60C limit was for a very small number of (faulty?) boards.
The normal limit has been 85C for years.

[marcosbong]

I'll let it throttle at 60C.
60's are reached quite easy without a heatsink, and that means that 70's will be hited with moderate heavy loads. And 70's are not good for SoC's health, IMHO

My 3B+ with heat sink runs at 1.4GHz all the time - regardless of how heavy the load is.
When the load is large and runs for a long time is when you need all the GHz you can get!
The 60C limit was for a very small number of (faulty?) boards.
The normal limit has been 85C for years.

Thanks for de info

[saulozitos]

OK then...
My settings are:

#uncomment to overclock the arm. 700 MHz is the default.
arm_freq=1600
core_freq=400
gpu_freq=400
v3d_freq=400
h264_freq=400
over_voltage=6

Ran the test for 10 minutes and temp rose to 44oC

So stop the test, put the fan to regulator feed (12v) and re-ran the test for an hour and 5 minutes

Peak temperature measured 38.1oC

And the current peaked at 2.7A according to the power supply.

That's quite an aggressive test!

Hi TimB101!
I would like to talk about your overclock. Could you post some photos of this setup?
I have a cluster with 6 rpi 3b+.

[ProDigit]

I'll let it throttle at 60C.
60's are reached quite easy without a heatsink, and that means that 70's will be hited with moderate heavy loads. And 70's are not good for SoC's health, IMHO

My 3B+ with heat sink runs at 1.4GHz all the time - regardless of how heavy the load is.
When the load is large and runs for a long time is when you need all the GHz you can get!
The 60C limit was for a very small number of (faulty?) boards.
The normal limit has been 85C for years.

No,
The hard limit on the 3B+ is at 80, but you'll probably never get there, unless you void the warranty (force turbo + overvolt > 6).
Under normal circumstances, the Pi 3B will throttle to 1,2Ghz at 60C. You can manually adjust that to 70.
Doing so, it'll also lower the over_voltage, resulting in the CPU never exceeding that temperature (if you run a small heat sink).

[Ullas]

Earlier my Pi3B+ used to run....now it flies. This is what I did.

#Overclock Settings
arm_freq=1500
over_voltage=8
temp_limit=80
core_freq=500
force_turbo=0 (avoid force turbo=1 it will corrupt your SD card)

#GPU Based
gpu_mem=128
h264_freq=333
avoid_pwm_pll=1
v3d_freq=500

#Ram Overclock
sdram_freq=500
sdram_schmoo=0x02000020
over_voltage_sdram_p=6
over_voltage_sdram_i=4
over_voltage_sdram_c=4
boot_delay=1
disable_splash=1
max_usb_current=1

[Imperf3kt]

Earlier my Pi3B+ used to run....now it flies. This is what I did.

#Overclock Settings
arm_freq=1500
over_voltage=8
temp_limit=80
core_freq=500
force_turbo=0 (avoid force turbo=1 it will corrupt your SD card)

#GPU Based
gpu_mem=128
h264_freq=333
avoid_pwm_pll=1
v3d_freq=500

#Ram Overclock
sdram_freq=500
sdram_schmoo=0x02000020
over_voltage_sdram_p=6
over_voltage_sdram_i=4
over_voltage_sdram_c=4
boot_delay=1
disable_splash=1
max_usb_current=1

Over_voltage is capped at 6
Temperarure limit at 80 is lower than default 85
Force turbo corrupting your SD card is nonsense. What it does is void your warranty and stops the CPU governor.
It is 0 by default.

I stopped reading here, these settings look like a cobbled together copy/paste from the internet with no idea what they do.

[BluPI2]

I'm running these settings and it is much snappier than stock on my Raspberry Pi 3B+

Code: Select all

arm_freq=1500
gpu_freq=500
over_voltage=6
gpu_mem=192mb

I would however see if your Pi is stable at a lower voltage before going all the way to over voltage 6.
Max temperature with cpuburn-a53 was 67C, using a small heatsink and a 30mm Fan. Under normal
usage it never rises above 45C. System is very stable.