GPU Computing is much, much, much, much faster than CPU Computing.
So it's very much appreciated to see a GPU Client for NFS@Home.
I have contributed my CPU's and GPU's to BOINC (Berkeley Open Infrastructure for Network Computing) for more then 10 years (and the calculated number is so hight that you can not even count it - hehe - and it's continuous counting/calculating and get higher and higer [I have already achieved some real stuff for this world (with BOINC) and I'll make it / continue to operate ...] ... .
For GPU Computing (here is just 1 example) please have a look at: http://boinc.berkeley.edu/wiki/GPU_computing
PS: I have at the moment 2 ATI RADEON HD 9670 running for some projects that use GPU (Computing) - Billions/Trillions of Operations per Second.