Im using the 12.3 WHQL driver, still able to underclock memory to 200 Mhz (optimal speed), Core Clock is now at 1020 Mhz
hashing away at 457 Mhash/s on my single 6970 using vectors (77 degrees Celsius for temperature)
Also I'm using full release OpenCL 1.2 driver, but the only difference I noticed is more stability. Used to have my core clock at 1015 Mhz
What hashrates is everyone else getting that are so bad with new drivers?