NVIDIA allegedly taped out the GeForce 7900 GTX (G71) GPU, The Inq reports.
The only problem is that we're unsure what the real schedule is. I can tell you that it is probably not realistic to expect this chip and cards based on G71 sooner than end of February. Early March could be the best bet, but this is the perfect case scenario. It is a long time from tape out till final chip and we know that Nvidia taped out the chip in the first half of January.
Whether the GeForce 7900 GTX will be faster than ATI's Radeon X1900 XTX isn't sure but we do know that this 90nm GPU has 32 pixel pipelines.