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GPU Diode Temp 10+ degrees hotter?

3017 Views 4 Replies Latest reply: Oct 5, 2009 2:46 PM by Dave Barnes RSS
Christopher Damiani Calculating status...
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Oct 4, 2009 8:25 AM
I have a question re: the gpu diode temp in my early 2008 imac. I have the 24" with the 8800 gs. I didn't really pay attention to my temps before, but the past few days the imac had a few instances where it "hung" with the spinning beach ball.

I ran all the normal diagnostic programs and there is nothing out of the ordinary. The one thing I have noticed is that the GPU diode temp is roughly 10 degrees hotter than the GPU and GPU heatsink temps.

My questions are:

What is the difference between the diode and the GPU? (I know what the heatsink is).

Is it normal for a discrepancy this big? I have searched the apple forums and macrumors for a while and haven't found one where it is more than 5 or 6 degrees.

Currently the GPU is 49 deg C, and the Diode is 60 deg C under light load (safari).

Thanks
iMac Core2Duo 24" 8800GS, iMac G5 17 1.8 Ghz Rev A 768 MB RAM 80 GB HD, Mac OS X (10.6.1)
  • den.thed Level 7 Level 7 (23,345 points)
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    Oct 4, 2009 9:32 AM (in response to Christopher Damiani)
    Hi Christopher

    My Early 2006 Intel iMac has a different internal configuration and sensor array, so it's difficult to compare the readings side by side. I can however say that 60 C is nothing to worry about, my GPU Diode normally runs between 60 to 70 C depending on usage. Any reading above 75 C might be cause for concern and anything above 80 C is.

    Normally a spinning beach ball is caused by a lack of ram, a busy processor, a nearly full HD and or flaky HD. See > http://www.thexlab.com/faqs/sbbod.html

    Dennis
    17" Early Core Duo - 320GB WD Caviar Blue Internal HD - 2GB RAM -, Mac OS X (10.6.1), - Maxtor FireWire HD's - WD Passport HD - Epson - 80GB Classic - 2GB Nano
  • den.thed Level 7 Level 7 (23,345 points)
    Currently Being Moderated
    Oct 4, 2009 12:17 PM (in response to Christopher Damiani)
    No according to both iStat Pro and Temperature Monitor my earlier model only has a sensor on the GPU Diode.

    I'm sure that is normal, hopefully someone with the same model will chime in with there stats.
    17" Early Core Duo - 320GB WD Caviar Blue Internal HD - 2GB RAM -, Mac OS X (10.6.1), - Maxtor FireWire HD's - WD Passport HD - Epson - 80GB Classic - 2GB Nano
  • Dave Barnes Level 4 Level 4 (2,975 points)
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    Oct 5, 2009 2:46 PM (in response to Christopher Damiani)
    My iMac 7,1 has both.
    Currently 60° and 61° C respectively.
    I am running FanControl with CPU minimum rpm set to 1800.

    At other times, I have seen a wider temperature delta.
    iMac (2.8GHz,6GB), iMac (3.06,6GB), AirBook (1.6), MacBook (2.16), iPhone, Mac OS X (10.5.8), Brother HL-4070CDW, 6 iPods, OWC FW drives

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