Raspberry Pi Overclocking Guide – Cheap, Fun, and Overclockable (with HWBOT Prime)

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Belgium Massman says:

Anyone having fun yet?

Belgium richba5tard says:

Me! Awesome little thingie.

kikicoco1334 says:

yeppers!!!

Belgium Massman says:

I'm gonna update the article with some information on 3D benching and influence of PSU.

Belgium geoffrey says:


Netherlands VictordeHollander says:

Awesome guide!
And yes, the JDK8 1.8.0-ea-b100 is very good on ARM devices. I think it is because of the VFP support.

On my ODROID-U2 (4x ARM Cortex-A9 @2,0) I got a score of 2419,06 with Ubuntu 13.04
But the CPU needs to be added to the database before I can submit, so just a link for the time being:

Belgium Massman says:

Awesome, is that Linux on your Galaxy Note?

//edit: just figured out it's an Odroid Hardkernel. Nice. Couldn't help myself and just bought one as well :D

Denmark SharkOC says:

I have been playing quite alot with it now. Still having a hard time getting Java 1.8 to work on Arch linux
Just ordered 2 more units after I found this person: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=51119&p=395436

running 1400mhz arm_core

My first unit are having problems with higher than 1165 mhz arm_core and that only gives me 540 points

United States Bobnova says:

Pi binning time :P

Belgium Massman says:

Until I see benchmark results, I call BS on all those rediculous RPi OC results. There was a guy at OCN claiming 5GHz on ln2 too, but obviously tha's BS too. So far, most cap out at 1200-1250 on air cooling with overvoltage=8.

Belgium geoffrey says:

SharkOC said: I have been playing quite alot with it now. Still having a hard time getting Java 1.8 to work on Arch linux
Just ordered 2 more units after I found this person: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=51119&p=395436

running 1400mhz arm_core

My first unit are having problems with higher than 1165 mhz arm_core and that only gives me 540 points


Hey, I get it working like this:


pacman -S vim
(I'm used to working with vim to write/edit txt files)

wget http://www.java.net/download/jdk8/archive/b100/binaries/jdk-8-ea-b100-linux-arm-vfp-hflt-24_jul_2013.tar.gz
(or go to the oracle java 8 website and download from there)

tar -xzf jdk-8-ea-b100-linux-arm-vfp-hflt-24_jul_2013.tar.gz -C /opt

export PATH=$PATH:/opt/jdk1.8.0/bin
(link Java to system variables, you have to do it each time you reboot)

java -version
(check if Java is working)

wget http://downloads.hwbot.org/hwbotprime.jar

java -jar hwbotprime.jar

Belgium richba5tard says:

geoffrey said:

export PATH=$PATH:/opt/jdk1.8.0/bin
(link Java to system variables, you have to do it each time you reboot)


Set this in ~/.bash_profile and you don't have to type it after reboot.

echo "export PATH=$PATH:/opt/jdk1.8.0/bin" >> ~/.bash_profile

Netherlands VictordeHollander says:

@Massman
The Odroid-U2 is indeed an awesome little thingie, with a lot of performance and only consuming max. 10W! I haven't figured out how to 'OC' it beyond 2GHz.
Hardkernel now also has an ODROID-XU with Samsung Exynos5 Octa big.little design (4x Cortex-A15 @1.6Ghz + 4x Cortex-A7 @1.2Ghz). It starts shipping in September and is now $149 pre-order. Unfortunately you can only use 4 cores at the same time.

It would be interesting to see the performance differences between the ARM architectures (ARM6, Cortex -A7-A8-A9-A15)

Bulgaria I.nfraR.ed says:

Got it working on my smartphone. First I tried Debian, but couldn't solve the java command symlink.
Although there was a symlink in /usr/bin, it was still reporting that there's not.
So I've installed the Raspbian.
Here's my first run: http://hwbot.org/submission/2412106_i.nfrar.ed_hwbot_prime_4x_arm1176_s_1360.94_primes_per_second

Phone is Lenovo A820 with Quad-core ARMv7 MT6589 chipset + SGX544MP video. What is the correct category to submit?

Unfortunately MTK-based phones can't be overclocked yet, so I'm stuck at 1.2GHz.

BTW, it's using 2 threads only, don't know why - maybe it's because I'm running it chrooted (as a slave OS).

[CODE]
root@infrared:/# java -jar hwbotprime.jar
java -jar hwbotprime.jar
No native cpu speed library for linux yet... falling back to OS tools.
--------- HWBOT Prime 0.8.3 ----------

Processor detected:
ARMv7 Processor rev 2 (v7l) MT6589
Estimating speed... 2x 1,209MHz @ 37.347 C
976 MB memory
Running benchmark using 2 threads.
Starting benchmark...
Warm up phase: ..................................................................................................... done!
Benchmark phase: ..................................................................................................... done!
All done! Current CPU temperature: 37.971 C
Score: 1360.94.
Hit enter to compare online, enter a filename to save to file, or type q to quit.
[/CODE]

Belgium Massman says:

Use this category: http://hwbot.org/hardware/processor/mediatek_mt6589/ You can manually increase the threadcount with hwbot prime. Or do you think the OS is only using two either?

Bulgaria I.nfraR.ed says:

I'll check when I install it again, but I think it's due to the virtual machine mode. And I'm Linux noob :p

Belgium Massman says:

You and me both, hehe. At least I now found out how to read a kernel, and I think with the right guide I'll be able to "update" an existing one.

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