Loud fan noise using OS 9 (G4 MDD)

Discussion in 'PowerPC Macs' started by Nova77, Aug 21, 2011.

  1. Nova77 Guest

    May 12, 2011
    Ok, we all know G4 MDDs aren't the most silent machines...
    But why do the fans run twice as fast when I'm using OS 9 (compared to OS 10.5)??
    Any way to fix this?
  2. ThunderSnake macrumors 6502

    Jul 23, 2010
    What firmware do you have installed? In OS9, fan speed is controlled by firmware instead of software.

    More info.

    Also, if you're running CHUD nap mode in Leopard, OS9 is probably running hotter even at idle (than you normally run in Leopard) and kicking the fans up higher.
  3. Nova77 thread starter Guest

    May 12, 2011
    I'm not using CHUD nap mode. Fans turn X2 speed even at start under OS 9, and don't tell me the CPU is already hot loll...

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