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Quieting a Mirrored Drive Door Power Mac G4
Authored by: g3ski on Mar 01, '07 11:50:14AM

90CFM to 18dBa ratio is awesome. I picked up a sub-20dBa fan that was supposed to be in the 75CFM range, but it wasn't cooling the CPU enough.

Nap mode has been know to be problematic on MDD towers - never worked on mine.

The fans in the powersupply are the worst offenders. They were rated around 55dBa to 45CFM, with stepping. It was actually difficult to find a worse ratio.
Replacing the fan within the power supply is a big undertaking, b/c you have to pull the whole computer apart, then dismantle the power supply, but it's worth it for a cheap solution.

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"I want my two dollars!"



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Quieting a Mirrored Drive Door Power Mac G4
Authored by: trevbucky on Mar 06, '07 08:26:24PM
Yeah I tried a 72 CFM 120 mm fan first & this just didnt cool it enough. I havent had any problems with nap mode whatsoever! Have you tried upgrading to 10.4.3 or later? Earlier problems people were having as documented on this site below were on MDD macs running 10.3.x. Also I always use the Combo updaters.

http://www.xlr8yourmac.com/feedback/MDD_CHUD_feedback.html#storytop

Quote" Although one MDD owner initially reported problems after the 10.4.3 update with CHUD 3.5.2 Nap mode, he later said it seems ok now. 4 other MDD owners wrote they've seen no problems in 10.4.3 w/CHUD 3.5.2 NAP mode."

It's definitely worth doing the power supply fan replacement with the Thermaltake Vocano 5 Heatsink fans. I was a bit scared to do it as it all sounded too difficult, but if you get organised, take your time & do it carefully you should find it quite easy if you have some basic experience tinkering with electronics. Just follow the excellent instructions posted on this page:

http://www.xlr8yourmac.com/systems/g4_mirrored_drive_doors/noise_reduction/g4_ddr_noise_reduction.html




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