Late last year Nvidia released their G80 (Geforce 8800) series to the masses.
With it's DirectX10 capabilities Nvidia has ruled the graphics market for a few months. So AMD (ATI) lingered and came up with a monster (literally).
ATI's new generation is more advanced that the 8800 in almost every way. There will be a XTX version and an XT version of the card.
XTX: 65nm processor size 64 shader pipelines 32 TMU's &ROPS 128 shader operations per cycle 1GB GDDR4 1.1 GHZ clock speed 140 GB/s total bandwidth Consumer memory support 1024MB Full DirectX 10 compatibilaty
Expect the XT version to have slower clock speeds and 512MB's of GDDR3 memory. The XTX will run at $630 RTP. Which coincides with the 8800GTX pricing.
ON Benchmark testing the R600 runs on average 10fps (frames per second) faster than Nvidia's offerings. Of course with driver updates the card will be nipping at the heel of the 8800GTX for graphics card supremecy.