Fudzilla writes, "Nvidia's Geforce GTX 285 is currently the fastest single chip graphics card around. It was launched on 15th of January this year, and the launch was particularly interesting since many partners already had their OC versions of the cards. We've seen that the GTX285 is faster than GTX 280, which is a direct result of the 46MHz overclock, and the card now runs at 648MHz.
With the 55nm manufacturing process in motion, Nvidia was encouraged to overclock their cards as the aforementioned process results in a die shrink. That, in turn, results in better thermal properties and lower power consumption.
Apart from the shrinking, GT200 GPU hasn't changed much during the transition process. We still have 240 stream processors, 32 ROPs and GDDR3 memory with a 512-bit memory interface."