SetiroN/lge-kernel-star — comment on commit 9ec9df194a950b51408047c64836f32fb1f6da9d
File:  line 0
By SetiroN:

I thought so too in the beginning, but I wanted to make sure and tested with a very straight forward method: increase them, look for instability. If the phone starts misbehaving, the overclock must be having an effect.
This way I discovered that (at least on my phone) system can go as high as 380000 without causing issues unless in complex 3D environments, while the GPU, although almost stable at 433MHz, sometimes crashes.

While AVP/EMC/DDR do behave like you say, system and GPU frequencies can definitely be changed: what remains to be seen is what actual frequency is being applied (for example any GPU frequency over 300MHz before 400MHz makes absolutely no performance difference, which makes me think it's falling back.

dmesg | grep KHz give a weird output: 133MHz GPU and system clock on my kernel, 120MHz on vork normal... must be wrong I think.