PowerMac fan speed increase after 10.5.2

Discussion in 'PowerPC Macs' started by Lord Zedd, Feb 15, 2008.

  1. macrumors 6502a

    Lord Zedd

    Anyone else notice a 1000rpm CPU fan speed increase on their G5 after the last round of system updates?

    My CPU's used to idle at ~120*f with a fan speed of 500rpm. After the 10.5.2 update they idle at ~89*f and 1500rpm. There is no perceptible noise change and I didn't even notice the change until I saw the cold CPU temperatures.

    I'm not worried about it, I'm just wondering if I'm alone or this is one of the system level .2 changes not massively publicized.

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  2. macrumors 68020


    If there's no increase in fan noise I'd suspect that iStat widget is mis-reporting. When my G5's fans rev up I know all about it ;)
  3. macrumors 6502a

    Lord Zedd

    MenuMeter would have to be mis-reporting as well as it shows the same temperature/RPM as iStat Pro.

    They would also get as hot as 160*f at full load before the CPU fans would kick up to 800rpm (as high as they ever went before). Only the slots intake fan and X1900 have ever made audible noise during normal use.

    After some stress testing the CPUs now peak at 120*f. :)

    EDIT: This is all with the processor performance setting at Highest.
  4. macrumors 6502a

    Lord Zedd

    Interesting, they have gone back to 500rpm... :confused:
    I was really hoping it would stay at 1500rpm, having the CPU's running at non-blistering temperatures was kind of nice.
  5. macrumors 6502a

    Lord Zedd

    I never found a way to get the fan speeds back up so I installed my own fan. Turns out a 120mm fan (cannibalized from a PowerMac 8600) fits snugly in the heatsink inlet shroud leaving only a few mm above and/or below uncovered. I took power from a spare power connector plugged into the hard drive's standard power plug (Since it gets power from the SATA plug).

    With no perceptible increase in noise I have the CPUs running in the 85-120*f range again instead of 120-160*f. :)

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  6. macrumors regular

    This is a cool idea. I would like to add a fan to my graphics card heatsink and my questions is where to hook the fan.....this is really interesting though. anyone else do think?
  7. macrumors 601


    Yes that's a good idea if you have the molex power connector on your hard drive, if you don't you can tap into the optical drive connector.

    This looks pretty cool as I might try this myself if it would drop 10*F, since I normally run at 115-120*F. Never seen it any higher than 130*F while encoding video.
  8. macrumors newbie

    Where would I purchase such a fan ?

    Does anyone know where I cud get this type of fan ((120mm fan (cannibalized from a PowerMac 8600)) ?

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