lolz..stinger I couldve sworn you had a 8800GTS... ah well
anyway, for folding you may just want to run the standard, console or GPU client. If you want to be a points mogul... on your setup you could get A GPU client going for your 2900 and at least one cpu core with a console client. DONT mix to gui clients together
I'd be extremely interested to see what the 4870 does with FAH. I was a bit dissapointed with the HD3450 folding prowess...