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

[xsacha]

(05-26-2013 01:28 PM)zarles1 Wrote:  As a result:
People always claim that OCing is totally useless as a mean to improve emulation speed but this little test showed that there actually is a noticable effect.
I'm not a developer so please correct me if I'm wrong.

1200MHz is a very low clock. This is like 800MHz on a Krait or Cortex-A15.

Also, I'm not sure if you made sure of this.. but in a lot of mobile SoCs, the CPU clock is linked to the GPU clock. Overclocking the CPU can overclock the GPU. This would make sense since you only seem to get a 50% performance improvement from a 140% overclock.
However, I think it's simply that the game you tested doesn't use the GPU very much.

In almost every game I play (decent graphics), the CPU is able to generate 60 frames (so you can get 60 VPS with frameskipping) but the GPU is not able to render the 60 frames. So, without frame skipping, you get something lower than 60 FPS.
Examples off the top of my head: Tekken 5, Tekken 6, Soul Calibur.
In these games, I get the same FPS (under 60) at 1.2GHz, 1.4GHz, 1.6GHz and 1.7GHz when GPU clock is fixed at 650MHz.