2 problems with 7970: high clock during desktop activity and strange noise under loa

[autior]

Hi, I just bought a Sapphire 7970 and installed the latest drivers, but this is what happen:

For few seconds the VGA switch from low to high clock (like when gaming) and then return to low clock, all of this during normal desktop activity, like surfing on internet,

The second problem is that the VGA emits a strange noise (like a whistle) under load, and I noticed that when it emits this sound I can see the PWM backlight flickering clearly.

Any help would be appreciated, thanks.

 

[alcoholbob]

If you are getting coil whine, turning on vsync should help, generally the whine happens when fps is very high.

Also your web browser might have hardware acceleration enabled, which is causing the card to go into 3d clocks like when a flash advertisement loads. Turn off hardware acceleration in your browser settings and you should be fine.

 

[autior]

If you are getting coil whine, turning on vsync should help, generally the whine happens when fps is very high.

Also your web browser might have hardware acceleration enabled, which is causing the card to go into 3d clocks like when a flash advertisement loads. Turn off hardware acceleration in your browser settings and you should be fine.

Actually the noise was the coil whine you were talking about (tried with Civ5: no noise with V-sync activated, noise without it). Never heard about this, thank you for the info.

About the "clock switching" during desktop activity, I disabled HW acceleration in my browser, and now I got the clock switch much less frequently (but I got it anyway. Is due to Aero?). I'll try to reinstall the drivers and see what happen.