Introduction
I was surprised to find that the top right fan on the G5 iMac (first generation) changed design; one had 36 blades and gave an annoying whine, while the other design has 29 (a prime number) and yields a comforting hum.
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To the left is the desirable design and to the right the one that generates more noise.
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ifixit carries both designs and was most helpful in ensuring that I got the correct one.
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Another way to tell the difference is that the bad design is attached with cross head screws, while the good design is attached with torx screws; however the old screws can be used on a new fan.
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The better fan turns an almost unusable G5 iMac into one that is much more acceptable.
The better fan turns an almost unusable G5 iMac into one that is much more acceptable.
