Ati 4890 strange fan noise at lower speed

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:
3 answers Last reply
More about 4890 strange noise lower speed
  1. Is this normal??
  2. I also discovered that, if i hold the case horizontal, it makes less noise when compared to the vertical.
  3. 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.
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