It looks like the big bad R600 had a bad driver. The driver was ok but the performance could be even better. The final goal is clear R600 have to be faster than G80 and a potentially even faster G80 chip.
The 8.351 was supposed to be a launch driver but the plans have change. DAAMIT now has a new launch driver. This one will be known as 8.361 and its first version is scheduled for late march.
The WHQL of the same driver is expected by the middle of April, still on time for the early May announcement. A lot of changes and we hope it will make R600 look good on launch.