cpu clock's impact on fps [GT-I9300]

[zarles1]

Thanks to all of you for your replies.
I just tried out a few Benchmark apps (Quadrant, Nenamark, Basemark ES2 Traji) and with both overclocking CPU(to 1,6 GHZ) and GPU (from 440 to 666 MHZ) using STweaks the results improved by 10-15%.
@XSacha: Thanks for the advise. I checked with STweaks whether CPU-OCing with NS-Tools affects the GPU-clock but it didn't. I'll give other games a try to experiment with OCing^^

Just one more question: Henrik said something about OpenGL drivers on Android. I guess, they're always bound to the Firmware (like Jelly Bean 4.1.2) or is there a way to get enhanced drivers?