Most sites posting info on fermi right now are just crap so don't trust them unless trusted sites like hardware canucks post something. There have been false rumors since over a year ago about fermi. Sky posted a mini preview and that show the GTX 480 is faster than the 5870 by about 30%. I believe it is going to be a powerful card. It is going to be expensive and you are going to have to wait a bit for a water block but I believe the wait will be well worth it. Plus if you wait ATI should do a price drop.
I don't care what people say there are some good times to buy and some not so good times. If it is less than a month and a new product is coming out you basically are setting yourself up for possible regret so be patient and you will be happier and make a wiser purchase.
I believe Nvidia will retake the performance crown without a doupt.
Here is a link to the mini preview by Sky someone you can trust.
NVIDIA’s GeForce GF100 Under the Microscope
I put it straight to the benchmarks but if you want to learn more about fermi than I suggest reading the whole article.