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Zt desktop rear fan is very noisy upon startup. usually will quiet down after a while or with a smack. Have already cleaned all fans. Sound appears to come from the fan in the very back.

Answers :

Depends on how much use the fan has had in its life, ive got a new pc and the 120mm fan supplied in the rear is not the top of the range and is already making a noise after only a few months of service life. just bite the bullet and buy a new one, you get what you pay for in terms of fans..go for a ball-raced one, not a sintered bronze oiled for life bearing,the fan impellers only need to be slightly out of balance at high speed and they will wear the bearings very fast indeed. i run rc electric planes powered by very fast fans ( 15000-35000 rpm ) and it realy shows on them...good luck & buy a new one :)
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