Yeah 4870x2 was terrible when it came out driver wise... crisis was an artifact adventure... no idea if its better now
In my experience nv is doing a slightly better job with dual gpu drivers but I'd still prefer a single gpu, hill

But about tdp... when you push silicon to the limit you get 10% extra perf for maybe 20% more power... IF that's the case with gf110 then maybe a dual gpu card is able to get more performance out of the 300 w limit... if NVIDIA can pull this off I'd be very impressed!