Controlling fan speed on an Ati HD 4850

I'm trying to lower the fan speed on my gpu. I used to do it with Ati tray tools but I recently reinstalled Windows 7 and it does not work anymore. I tried Rivatuner which doesn't work also.

I finally found Msi afterburner and fanspeed work, but both cannot lower the fan speed below 50%.

Any ideas?

2 answers Last reply
More about controlling speed 4850
  1. Update the driver? It maybe a driver glitch.
  2. I'm using the latest catalyst.
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