I could not find the specs just for the 5900 but here is the ultra. Usualy it is the clock rates though.
GeForce FX 5959 Ultra
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Graphics Core: 256-bit
Memory Interface: 256-bit
Memory Bandwidth: 30.4GB/sec
Fill Rate: 3.8 billion texels/sec
Vertices/sec. 356 million
Memory Data Rate: 950mhz
Pixels per Clock (peak): 8
Textures per Pixel: 16*
RAMDACs 400mhz
Pretty mean card. I have the ATI 9800 Pro and it is great!
