with most powerful intel core i7 965 you can get around 70 GFLOPS and 50GB/s L1 cache speed. to ram it is 13GB/s
Radeon 5870 have 2720 GLOPS and 150GB/s from VRAM.
so with suitable task you can get significant speed up on GPU.
@nou: thanks. I presented the info you gave to my prof. And he was convinced y i wanted to bring GPU into the picture
Thanks a lot!