moccor
Posts: 4
Joined: Wed Mar 21, 2018 12:59 pm

Looking for Pi 3 B+ overclock Settings

Wed Mar 21, 2018 1:04 pm

Hi, I am extremely new to the Raspberry Pi scene and I apparently decided to buy a Pi right after Pi day (must've been coincidental advertising :p). But since I bought the newest version, there is really not much info in terms of overclocking a Pi 3 B+. I'm actually really good with overclocking+undervolting PC's and laptops, but the whole text-based overclocking is weird and hard to understand.

If anyone has some settings they've already currently made for their Pi 3 B+ and would like to share + answer some questions that would be appreciated.

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Re: Looking for Pi 3 B+ overclock Settings

Wed Mar 21, 2018 1:28 pm

The B+ is running pretty close to max already, you might if you are lucky get another 100Mhz or so. I did read someone had got to 1450 from 1400.

Overclocking technique is the same as on the 3B.
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moccor
Posts: 4
Joined: Wed Mar 21, 2018 12:59 pm

Re: Looking for Pi 3 B+ overclock Settings

Wed Mar 21, 2018 2:57 pm

Yeah I had zero experience with Raspberry Pi's until yesterday and most Pi 3 overclocks end at 1400. Mine seems to stay cool very well with the setup (heatsinks + Grizzly kryonaut + Super glue + fan). Was jw if someone had a 1400+ for their Pi 3 B+ and the settings - since text based OC is much different than BIOS/GUI

TheProrok29
Posts: 5
Joined: Wed Jan 17, 2018 5:34 pm

Re: Looking for Pi 3 B+ overclock Settings

Fri Mar 30, 2018 9:15 pm

I can confirm that my RPI 3b+ I can overclock stable only to 1.45GHz. My old RPI 3b work from 1.2GHz to 1.4GHz also stable.

W. H. Heydt
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Location: Vallejo, CA (US)

Re: Looking for Pi 3 B+ overclock Settings

Sat Mar 31, 2018 1:38 am

The Pi3B+ might be considered an overclocked Pi3B, since the default was raised from 1.2GHz to 1.4GHz.

MaxK1
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Re: Looking for Pi 3 B+ overclock Settings

Sat Mar 31, 2018 9:16 pm

Overclocking has always been a crapshoot and there is probably less "headroom" to work with on a 3B+. I haven't (yet) tried overclocking my 3B+. I had 1 3B overclock to 1.44 GHz and a couple of others that went to 1.35GHz. I'm hoping for somewhere between 1.55GHz and 1.6GHz with a large heatsink and fan... (I haven't seen any reports of anyone getting to 1.6GHz... yet!)
You are in a maze of twisty little passages, all alike.
When General Failure and Major Disaster get together, Private Parts usually suffers.

TheProrok29
Posts: 5
Joined: Wed Jan 17, 2018 5:34 pm

Re: Looking for Pi 3 B+ overclock Settings

Sun Apr 01, 2018 10:34 pm

I has fan and copper radiator on my RPI 3B+ but this doesn't help. Even 1.45GHz is not stable. My power supply is 5v 3.1A

MaxK1
Posts: 1043
Joined: Sun Aug 26, 2012 11:34 pm

Re: Looking for Pi 3 B+ overclock Settings

Sun Apr 01, 2018 11:16 pm

Like I said. It's a crapshoot.
You are in a maze of twisty little passages, all alike.
When General Failure and Major Disaster get together, Private Parts usually suffers.

klricks
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Re: Looking for Pi 3 B+ overclock Settings

Mon Apr 02, 2018 5:16 pm

TheProrok29 wrote:
Sun Apr 01, 2018 10:34 pm
I has fan and copper radiator on my RPI 3B+ but this doesn't help. Even 1.45GHz is not stable. My power supply is 5v 3.1A
No amount of OC is guaranteed.
Cooling does not make OC work. If the SOC temperature reaches 85C due to OC or any other reason, then automatic throttling will happen. Cooling will help delay that.
Unless specified otherwise my response is based on the latest and fully updated Raspbian Stretch w/ Desktop OS.

drgeoff
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Joined: Wed Jan 25, 2012 6:39 pm

Re: Looking for Pi 3 B+ overclock Settings

Mon Apr 02, 2018 6:19 pm

Temperature is not the only thing that limits how fast any chip can operate reliably. There are also electrical propagation delays and race conditions within the chip. Which of the two limits is hit first depends on the particular device. x86 chips tend to be more affected by the temperature one, ARM chips by the delays one.

People with experience of PC overclocking where cooling is the major focus will find that strategy is not so effective on RPis.

MaxK1
Posts: 1043
Joined: Sun Aug 26, 2012 11:34 pm

Re: Looking for Pi 3 B+ overclock Settings

Tue Apr 03, 2018 8:39 am

What other settings have you changed? There is more to it than just changing arm_freq in /boot/config.txt. The heatsink/fan allow it to run cooler when the cpu is really busy for extended periods.
You are in a maze of twisty little passages, all alike.
When General Failure and Major Disaster get together, Private Parts usually suffers.

Pi newbie
Posts: 2
Joined: Sun May 20, 2018 5:37 pm

Re: Looking for Pi 3 B+ overclock Settings

Sun May 20, 2018 6:16 pm

moccor wrote:
Wed Mar 21, 2018 2:57 pm
Yeah I had zero experience with Raspberry Pi's until yesterday and most Pi 3 overclocks end at 1400. Mine seems to stay cool very well with the setup (heatsinks + Grizzly kryonaut + Super glue + fan). Was jw if someone had a 1400+ for their Pi 3 B+ and the settings - since text based OC is much different than BIOS/GUI
I run at 1535 using fan and heatsink

snake_eater4526
Posts: 1
Joined: Sat Jul 14, 2018 6:11 pm

Re: Looking for Pi 3 B+ overclock Settings

Sat Jul 14, 2018 6:14 pm

my rpi3 b+ run at 1.5ghz cpu and 500mhz gpu very fine
i only have two tiny heatsink

temp=81°c max at 100% running for long time with sysbench

jahboater
Posts: 3049
Joined: Wed Feb 04, 2015 6:38 pm

Re: Looking for Pi 3 B+ overclock Settings

Sat Jul 14, 2018 8:14 pm

snake_eater4526 wrote:
Sat Jul 14, 2018 6:14 pm
my rpi3 b+ run at 1.5ghz cpu and 500mhz gpu very fine
i only have two tiny heatsink

temp=81°c max at 100% running for long time with sysbench
Try running this:-

Code: Select all

wget https://raw.githubusercontent.com/ssvb/cpuburn-arm/master/cpuburn-a53.S
gcc -o cpuburn-a53 cpuburn-a53.S
./cpuburn-a53
What temps do you get after an hour or so ??

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bensimmo
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Location: East Yorkshire

Re: Looking for Pi 3 B+ overclock Settings

Sat Jul 14, 2018 8:56 pm

The setting that give me the nicest feel to my Pi's is 'overclocking' the SD card bus.
I say overclocking, but I think the Pi uses a conservative approach and many cards now can easily run at the 100MHz setting.
Of course always best to get a good fast small file capable card first. That helps more than anything, especially if using at the desktop.
You can now look for A1 or A2 etc on the card (or Samsung EVO, EVO+, EVO Plus series of cards are A1 standard from my measurements,.but without the name).

After that the best guide so far is this in the RetroPie wiki
https://github.com/RetroPie/RetroPie-Se ... erclocking
While it has not been specifically updated to include 3B+, it's the same process anyway.

henryww
Posts: 7
Joined: Fri Aug 10, 2018 12:23 pm

Re: Looking for Pi 3 B+ overclock Settings

Wed Aug 15, 2018 3:26 pm

The 3B+ requires a few things; A really good PSU (5.1v to 5.25v), A really good cable, A good storage to boot of and patience.

Otherwise it is the same as overclocking any other Raspberry pi.

It can probably be pushed to 1600Mhz, the best I have got with it being stable enough to run benchmarks is 1550Mhz

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Imperf3kt
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Location: Australia

Re: Looking for Pi 3 B+ overclock Settings

Wed Aug 15, 2018 11:20 pm

snake_eater4526 wrote:
Sat Jul 14, 2018 6:14 pm
my rpi3 b+ run at 1.5ghz cpu and 500mhz gpu very fine
i only have two tiny heatsink

temp=81°c max at 100% running for long time with sysbench
If you are truly getting 1500MHz at 81℃, I'd be worried.
The Pi is supposed to throttle down to 600MHz once it reaches approximately 82℃
https://makezine.com/2016/03/02/raspber ... atch-fire/

One must remember, the SoC on a Pi is already overclocked from factory - the frequency these chips are designed for is only 700MHz!
Stop plugging your fan directly into the GPIO 5v
https://www.electronics-tutorials.ws/power/transient-suppression.html

d3m0n1q_733rz
Posts: 5
Joined: Thu Mar 24, 2016 11:03 pm

Re: Looking for Pi 3 B+ overclock Settings

Sun Aug 19, 2018 6:34 am

I just want to toss in here that a lot of people tend to think that overclocking is just as easy as adding the overclock option in the config.txt file. What they too often forget is that a little higher voltage is needed to push those clocks up to be stable. This is where the extra heat issue comes from. Generally speaking, you'll want to look at four things -- clock speed, voltage, stability, and temperature.
Increase your clock speed by 50 Mhz and see if it's stable. If not, make slight changes to your voltage until either it is, or you reach the voltage where you start to feel that it could be a little too much. Generally, I would say not to go more than one or two voltage steps higher than normal, but it's not my board, so not my call.
Then, check the temp under normal load. If it's too hot, either find a way to cool it, or back it back down. Then, check for stability by running something a little more intensive on it. Some people like to use a stress tester, but it can be harmful to push it that hard unless you're sure it's well cooled. Check temps while this is running to be sure that it's not throttling, and you should be alright. If you want to push it higher, repeat.
Remember, do this at your own risk.
8-)

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