I somehow agree with Guz that it is not tangible or significant improvement in the fps when you overclock the GPU.

Must be something to do with the timings of the memory because I cannot feel the games running faster with my naked eyes

For sure the GPU runs hotter with the new bios (currently at 830/950), which confirms the increased speed in the GPU.

Can somebody post results pre and post bios mod? No 3Dmarks please