EDIT: Hmm...after further review, looks like this card has 36 pixel shaders and the one they mention in the Anandtech review uses 48 pixel shaders. So may be you need the XT and not a GT. I guess further review is required...I'll do that and update later tonight.
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Seems very hot to me...and if you are folding@home, what an incredible boost to your numbers!
Folding@home FAQ re: ATI Client
At first, we will launch with support for X1900 cards only. X1800 cards do not provide the performance needed. These cards are actually quite different -- they have different processors (R520, R530 vs. the R580 [in the X1900 series]). The R580 makes a huge difference in performance -- its 48 pixel shaders are key, as we use pixel shaders for our computations. However, we are working to get reasonable performance from the X1800 cards (1/2 to 1/3 of the X1900) and we will likely support them soon (hopefully 1 month after the initial beta test roll out).
Anandtech Article
If I hadn't gotten the 7900gs from woot, i'd be all over this.