Looks like Tom has got his hands on these new graphics cards from NVIDIA. There is currently a ban on publishing any benchmarks but Tom did have this to say:
"In the standard tests without FSAA & anitotropic filtering, the FX 5600 Ultra seems to be just about the same or slower than a GeForce 4 Ti 4200 8x & Radeon 9500 PRO. This might be due to the reduced pixel pipelines (4x1 alias 2x2 (NV31) as opposed to 4x2 in NV25). With 4xFSAA, it appears to reach nearly double the performance of the 4200, beating a 4800 as well, but it loses out to the Radeon 9500 PRO. It's a similar picture with the anisotropic filtering. In the pixel shader tests from 3D Mark 2001, it beats the 4200/2800, but loses in the vertex shader tests. In both tests, it clearly loses to the Radeon 9500 PRO."
Read the full article here.
There will likely be a revised article with benchmarks some time next week.