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gigabyte gtx 770 4 gb fan sound

gigabyte gtx 770 4 gb fan sound
« on: October 20, 2015, 11:45:30 pm »
Hi

I have gigabyte 770oc 4gb wind force
Some times it make weird sound. But if i use msi afterburner and make it run faster sound stops. It stops even if i put fan speed on the same speed like it was before i used msi afterburner. I exit from msi burner , and sound don't come back for one day, some times for one week.

Edit: If I tilt my case about 45degrees and the sound stops. I stood it upright again and the sound came back. Its not coil whine. Is rattling noise like if you put piece of plastic joghurt on a bike wheel, but it is not so loud.
Any idea what could be wrong?