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[HOW TO] Overclock Raspberry Pi?

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Raspberry Pi overclocking 101:

0) download Soft-float Debian “wheezy” at http://www.raspberrypi.org/downloads on an SD card

1) boot your pi and open the config file which contains the cpu frequency:

#sudo nano /boot/config.txt

2) edit the line arm_freq=700 to any value between 700 and ± 1150

3) reboot

# sudo reboot

 

Benchmarking

Download a java 6, 7 or 8 runtime.

#sudo apt-get install openjdk-7-jre

Download latest HWBOT Prime

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

And run it!

#java -jar hwbotprime.jar

 

Lots of usefull info:

http://elinux.org/RPiconfig

=> memory overclocking, gpu overclocking, etc etc

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Testing java 6 vs 7, no difference here

 

with the new hwbot version (1.7.1) I see small difference, up to 3% faster with OpenJDK 7:

 

 

Raspberry-pi @ 700 MHz

OpenJDK 6 (1.6.0_27)

155.02 Primes/second

 

OpenJDK 7 (1.7.0_07)

159.76 Primes/second

 

 

 

Raspberry-pi @ 1000 MHz

OpenJDK 6 (1.6.0_27)

195.50 Primes/second

 

OpenJDK 7 (1.7.0_07)

197.45 Primes/second

Edited by geoffrey

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Massman has LN2 at the office and a Pi, but he's on computex right now. I'm eager to know what these little buggers can do on LN2. :)

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any idea how you can get past the ~1100MHz max clock setting? Is there software that allows more?

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Even with an adequate cooling system, we would need to vmod the board in order to get high frequencies (I suppose). And for this, I haven't found anything yet.

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Even with an adequate cooling system, we would need to vmod the board in order to get high frequencies (I suppose). And for this, I haven't found anything yet.

 

Well... it is HWBOT. Modding it is a very big possibility. EPower on Raspberry Pi :P

 

It will suck on cold ;)
Is there some stuff on there that can't get cold?

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Well... it is HWBOT. Modding it is a very big possibility. EPower on Raspberry Pi :P

 

Yeah, it should go well with our professional modding skills.

 

Memory chip might cause issues, I guess.

 

Then let's desolder it, put it away with some wire system so that we can cool down the ARM chip. :D

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Been playing a bit with the Raspberry Pi. So far, 212 at 1100/600/550. No idea how to get to 400, though.

 

There seems to be a problem for uploading the file to the hwbot server from the terminal. Not sure if user error or bug.

 

raspberryTest.jpg

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JDK8 is the key; over 200% performance boost :D

 

[hwbot=2405985]submission[/hwbot]

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oooh, awesome! That's the first +100% OC i see! I was just toying around with my raspberry and it seems java now comes shipped with the stock raspbian OS, and it's much faster than before. Performance seems on par with the jdk8 beta optimized for arm.

 

http://hwbot.org/submission/2473395_richba5tard_hwbot_prime_broadcom_bcm2835_585.41_pps

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Can somebody help me get past 1500mhz, start.elf i used from rpi forums doesnt work becouse i have 256mb ram version.

I have some of ln2 left and i dont want to leave it to go to waste.

 

PS: I already posted on rpi forums, if i also post here couldnt hurt :)

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Seems like there isn't much action with the Raspberry Pi 2 these days. I built a small pot for some dust off fun but I've seem to hit a wall.

 

force_turbo=1

arm_freq=1140

gpu_mem=50/50

core_freq=500

sdram_freq=500

over_voltage=8

 

Hwbot Prime Score: 1811 pps

 

http://hwbot.org/submission/2939059_oc_maximus_hwbot_prime_broadcom_bcm2709_1811.29_pps

 

20150803_175138_zpsaouiu8yo.jpg

 

I'm looking for a good vcore vmod. I've done quite a few vmods in the past but it has been a few years.

 

I did find this by Zen1:

 

» Sat Apr 11, 2015 8:08 pm

 

So, I've been working on this project for a while and I just wanted to share my results as there hasn't been much interest in overclocking the BCM2836. Today I managed to overclock my Pi 2 to 1500MHz and I just wanted to share to see if anyone else was interested. I removed L3 and soldered a lead on to the pad nearest C7 so that I could apply a separate core voltage. Using the software overvoltage setting of 8 only brings you up to 1.4V. I used an EVGA epower unit to provide a clean 1.66V. I used liquid nitrogen to cool the chip with a custom made CPU pot I designed. I had to use an extension cable for the SD card as it was getting too cold and I applied a heating pad to the bottom of the board to assist with keeping the RAM warm and defrosting the board. I found the chip coldbugs at -130C and refuses to boot under -90C. I found keeping the ram above 20C helped a lot with booting and stability.

So this is just a teaser to see if there is any other interest out there and to see if anybody knows of anyone who has gone further than this.

 

https://www.raspberrypi.org/forums/v...?f=29&t=107149

 

I've been staring at the schematics of the pi and located the L3 and C7 but am having difficulty replicating the vmod without a good picture of the soldering points.

 

Does anyone have a picture of this?

 

Thanks,

OCM

Edited by OC Maximus

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