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Ati 4890 strange fan noise at lower speed

Last response: in Graphics & Displays
May 18, 2009 4:59:57 PM

I have sapphire 4890 and i get strange noise ( other than blowing, like "Prrr Prrr Prrr Prrr" ) i tried to change fan speed manually, i don't here that sound under %25 speed.

I've recorded the noise:
May 18, 2009 5:01:46 PM

Is this normal??
May 18, 2009 7:07:22 PM

I also discovered that, if i hold the case horizontal, it makes less noise when compared to the vertical.
May 18, 2009 7:17:49 PM

Contact your supplier or Sapphire direct, it could be a faulty fan and the last thing a HD4870 needs it to have its fan stop working.