Got it on the 484Mhz clock by editing the gpu_oc file
Originally Posted by franciscofranco on XDA-Developer View Post
Just released r20 with some nice goodies:
* GPU overclock interface. Now you're able to choose which frequency you want your GPU to run:
To check the frequencies just do this: cat sys/devices/system/cpu/cpu0/cpufreq/gpu_oc
The default clocks are: 416 416 416 380 332 285 234.
To change to other clocks just do this: echo X X X 380 332 285 234 > sys/devices/system/cpu/cpu0/cpufreq/gpu_oc
Substitute the X with 484, 520, 550, 600 or 700 if you'd like. Be careful that on higher clocks the device might get extremely hot and unstable. You're on your own.