How to Overclock Samsung Galaxy S2 1.5Ghz 1.8Ghz 2Ghz
The overclock comes from the developers of SetCPU who has now managed to take the SGS2 to a whooping 1.504 GHz,and yielding Quadrant benchmark scores of over 4000. Truth be told, he was actually take it all the way up to unstable 2 GHz and quasi unstable 1.8 GHz. The only problems at these frequencies is that we use high voltages that heat up the processor and phone too much, beyond safe limits.
Note from developer:
I have successfully overclocked the new Samsung Galaxy S II to 1.504GHz. This speed is enough to allow it to achieve really high benchmark scores like over 4000 points in Quadrant! 1.5GHz is a 25% overclock and makes this fast phone even faster and snappier in day to day usage.
I haven’t gone crazy on the voltages – 1.504GHz is stable at 1375mV on my device. Depending on your device, there may be even more headroom. I’ve gotten speeds of up to 2GHz to boot with instability (my unstable 1.8GHz Linpack run is currently in the Linpack top 10), but at very high voltages and temperatures. Leave it up to other developers to give you higher/more dangerous frequencies and voltages. If you stress the CPU a ton the phone will become hot to touch
How to Overclock Samsung Galaxy S2
1. Use odin3 and the USB drivers for Windows, details here.
2. Grab the kernel. It is a tar file for odin with the overclocked kernel and a initramfs with proper modules for the kernel:http://setcpu.com/files/galaxysii_oc_v1.tar
3. Reboot the phone into download mode using ADB:
adb reboot download
4. Flash the kernel using odin3 by placing the tar file in the PDA section and pressing “Start.”
5. The phone will reboot automatically.
6. Use SuperOneClick to root your phone if you haven’t already. ADB should have root access with this kernel so it’ll just work.
7. Grab SetCPU and try 1.504GHz.
Source code (with relevant commit for the overclock. I also enabled the interactive governor in the config): https://github.com/coolbho3k/galaxysii_oc