Stanford U. has some tech info plus recommendations in this link about GPU folding.. http://folding.stanford.edu/English/FAQ-ATI
And WIKI has a lengthy article, also.. http://en.wikipedia.org/wiki/Folding@Home
Most newer graphics cards are likely candidates for the F@H process.. but older ones may not be.
The F@H client must be able to detect the CPU or GPU core model, and apply the "divisor" process so each core can be optimally used, while not interfering with needs by the user or donor.
Depending on the disseminating process, some steps may be extremely intricate, or very simple.. thus a reading of maximum or minimum core use at any time.
F@H.. to solve mankind's maladies.. in our lifetimes!