Might have to join the beta if there is gpu support. I want to see how good my GTX 570 is.
So far on the 560Ti they took about 40min to complete. There was no change to GPU temperature whilst they were running. And were worth 30 points each. (1K PPD, although BETA WU tell you nothing meaningful from points).
I have noticed that you can't run GPU + CPU at same time. GPU WU will use a normal CPU slot. Which is odd I think. But hey, this is testing so lots of unknown for now.
EDIT: And now my GT 210 is crunching 2 WU with 1hr 47min expected completion each. And a 204point WU error on the 560. Gotta love testing