Hi all, I'm having problems with my newly purchased Sapphire HD7970 OC. Fan RPM stays at ~1000, fan% doesn't affect it at all, neither does gaming. Rig is: - Win 8.1 x64 - Catalyst 10.9 and 10.11b tried. - PSU is 550W Antec, within spec. - Lucid VirtuMVP is not installed. Speedfan or Afterburner have no effect on actual fan speed, but they do increase the fan%. Same with gaming. The dual BIOS switch also doesn't work as expected, because the GPU clock stays the same - possible BIOS corruption? Things to try: - Driver before 10.9 - My identical card in the problem rig, and vice versa. - BIOS flash if it is easy. What can affect the PWM signal for the fan? I don't think it's bad PSU (GPU works fine otherwise), and I don't think it's a conflicting fan speed program (Speedfan was uninstalled). Any other things to try? Google has a couple of these issues, but no resolutions (as always ).