I would STRONGLY suggest NOT participating in the PG Challenges. The only thing the admins will understand is diminished production on the project. In reality, I don't think many will actually pull off because even at 1/2 credit there is nowhere to park your Cuda that pays more.

I will pull off at 250M which was my goal anyway. Two weeks ago I pulled 1 card off to run GPUGrid and even with 3 it should have taken me 30 days to get there. A week later they start dropping credits so I put the card back on ... still gonna take 30 more days. Now here we are almost a week later and the new wu take 10% longer ... so still need 30 more days. That is gonna be the longest 30 days of my life