Yup ST these are the new "

511s" we used to see back in the glory days of the GXT 280, 260, etc.
The higher shader counts of the 260 216sp and GTX 280/285 really helped with those WUs, compared to the 9600GSO, GT250s, etc.
Seems to happen once every GPU generation; new cards come out, and Stanford takes a while to get some WUs out with some science that takes advantage of the new generation.
That being said, every once in a while Stanford releases a WU that is just a hog, and will release another that is not so power hungry.
I also believe that the core 15 does not have the 'idle' feature, which helps keep temps down (I saw jedi over at the folding forums asking about it, and he is the guy who made the GPUtracker). This may make this particular WU more nasty than most.
This happens from time to time in folding. I took a huge hit in PPD recently when Linux bigadv folding stopped. I was hitting close to 80K PPD until then, and now I am lucky to hit 60K.
So I feel the pain, but its all a part of folding. You just have to know too that this is hitting all Fermi folders, so the playing field is leveled out a bit.