iMac 4850 - fan speed and temperature questions

Discussion in 'iMac' started by Sermon, Apr 22, 2009.

  1. Sermon macrumors regular

    Apr 19, 2009
    Well, so I downloaded and installed Temperature Monitor and iMac Fan Control - mainly for observational purposes and not for toying around with the fan speeds and I've got some questions. Mind you, I haven't tampered at all with the fan speed settings, just installed Fan Control. Here are my readings (while browsing the internet with Safari and doing a chat via iChat):

    Fan Speeds:
    CPU fan (desired) 1300 RPM / (current) 1530 RPM
    HD fan (desired) 2100 RPM / (current) 2099 RPM
    DVD fan (desired) 1300 / 1298 RPM

    CPU Heatsink: 92°F
    Internal HD: 108°F
    Internal DVD: 95°F
    GPU Heatsink: 107°F

    Are these, under the circumstances, normal readings?

    Thanks in advance for your replies.
  2. spinnerlys Guest


    Sep 7, 2008
    forlod bygningen

    And there are already a lot of threads regarding this issue, so if you want more confirmation/information, try MRoogle.
  3. DELTAsnake macrumors 6502


    Jul 18, 2008
    Compared to a regular computer those temps are low and the parts used are rated for much higher temps then they are being exposed to in the iMac.
  4. kdogg macrumors newbie

    Apr 2, 2009
    under normal conditions? it looks like you're doing something pretty CPU intensive, when I watch something on VLC, my processor does not go above 60C and my hard drive is typically around 50C. Even when I am gaming the hottest thing , the GPU and the power supply will get to 75C. But, I would not be alarmed over your temperature, life time tests for semiconductor devices are done at either 85, 105 or 125C ambient (for CPU and GPU it's typically done at the higher temperature ranges), which means the junction temperature in the device (which is what the CPU and GPU sensors read) are even higher.

    If you let your comupter sit for 10 or 15 min doing nothing, what are the temperatues then?
  5. Sermon thread starter macrumors regular

    Apr 19, 2009
    Like I said, at the time of the readings I had my iMac on for a little more than 3 hours, Safari was open (I was on some message board), Mail was open and iChat was open. That was it. No HD-movies, no Photoshop, no gaming, etc. Nothing that would stress the CPU.
  6. rsaeter macrumors newbie

    Mar 4, 2009
    92 degrees Fahrenheit = 33.3333333 degrees Celsius
  7. Sermon thread starter macrumors regular

    Apr 19, 2009
  8. polya80 macrumors member

    Apr 13, 2009
    Cambridge, MA
    I have a 2008 imac and my fan/temp are:
    fan (rpm):
    CPU: 1200
    HD: 1400
    OD: 700

    Temp (C):
    Ambient: 24
    GPU: 53
    GPU Diode: 58
    CPU A: 44

    Seems that the 2009 imac has a higher fan speed by default?
    Is your imac loud? I find my imac a teeny bit too noisy for my liking :(
  9. ineusch macrumors newbie

    Apr 14, 2009
    Paris, France
    On the mac side everything is fine, but on bootcamp/windows xp the temp goes much higher
    Can't really give numbers because the OS doesn't have that info, but I'm starting to wonder if windows is able to fire the fans correctly :/
    I was not event paying games... just installing stuff I use...

    Anyone else has this ?
  10. melsiea8 macrumors newbie

    Nov 30, 2009
    use smc control 97 deg---odd 2968--hdd 3815--cpu 3182.have r fan blowing from bottom

    replaced hd with sshd runs cool at 97 deg f​
  11. gjw4u macrumors 6502

    Dec 2, 2008
    melsiea8, hope you are aware, that you are quoting/answering a seven moth old post? ;)
  12. uploaded macrumors newbie

    Nov 6, 2009

Share This Page