Here's what they heard about the performance of this card from their anonymous source:
Next, we got hold of some preliminary benchmarks figures of the R600 XTX card with core clock at 800MHz vs a GeForce 8800 GTX card. Using a Core 2 Extreme 2.93GHz processor on an Intel 975X board, the 3DMark06 score at 1600x1200 resolution is 97xx on the R600XTX compared to 95xx on the 8800GTX. Seems like R600XTX is running slightly faster than 8800GTX on the early release of drivers for R600. AMD is still working hard on the drivers and there are some more performance left to unlock. However, the DX10 benchmarking war between ATi and NVIDIA has not started yet. The targeted display driver version for launch in May is 8.361 or later (Catalyst 7.4 or 7.5).It also seems that the yield of the R600 on 65nm is poor and that AMD expects a limited quantity of only 20,000 units to be ready by mid-April.