27" iMac GPU Diode Temperature?

Discussion in 'iMac' started by gmanist1000, Jul 4, 2011.

  1. gmanist1000 macrumors 68030


    Sep 22, 2009
    I have the new 27" iMac and when checking iStat my GPU Diode temperature seems very high. It's at 187 degrees fahrenheit, sometimes when the computer is doing nothing at all.

    I have the AMD Radeon 6970M - 2GB VRAM, if that helps.

    Is this too high? Should I install SMC fan control?

    Attached Files:

  2. alust2013 macrumors 601


    Feb 6, 2010
    On the fence
    Not sure about the GPU, it does seem a bit on the warm side, but it is a fairly hot part and that is within operating temps. However, that's definitely on the hot side for the HDD, so if anything I'd up that fan speed a little bit.
  3. tsugaru macrumors 6502

    Feb 9, 2003
    Reset your SMC and PRAM and see if it is still that high.

    I just finished playing WoW for 4 hours and my GPU diode was at 71C (160F.)
    It's at idle at the moment and is at 48C (118.4F.)
  4. omvs macrumors 6502

    May 15, 2011
    I have the same config, and that seems warmer than it should be. I don't think you need to install SMC fan control though - it looks like your optical drive fan has already spun up to compensate -- this is similar to what I see on my machine after I've been gaming for a few hours & the room is hot, though my GPU is more ~170deg.

    If the GPU really should be idle, I'd say its a potential problem. try the PRAM reset suggested (or a cold boot), let the machine idle for 20 minutes, and see what the temperature reads... I would expect numbers closer to your CPU temp...
  5. gmanist1000 thread starter macrumors 68030


    Sep 22, 2009
    Thanks for all the suggestions. It is very warm where I live, it was over 93 degrees Fahrenheit outside when I took the screenshot. That may be one of the problems.
  6. Badger^2 macrumors 68000


    Oct 29, 2009
    You should turn on the AC.

    Have you thought about calling Applecare?
  7. rikbrown macrumors regular

    Jun 29, 2010
    Mine is at 67C and I just quit playing EVE. I've seen it go into the high 80s (warm day at the time too though), so I think it's fine.
  8. gmanist1000 thread starter macrumors 68030


    Sep 22, 2009
    If we had AC I would. I haven't called them yet, if I encounter problems I will.
  9. WazoooGuru, Jul 15, 2011
    Last edited: Aug 19, 2011

    WazoooGuru macrumors newbie

    Jul 15, 2011
    Mine is hot, too

    I noticed the same thing a few days ago on my iMac (27" i7, 2011). My GPU temp was about 175° F with nothing running.

    After doing a few experiments, here is what I observed:
    My ambient room temp is about 77° F.

    I have a second display hooked up through the Mini-display port (20" Apple Cinema Display (ADC) via an Apple DVI to ADC Converter. When the display is plugged in, the GPU temp idles at about 170° F. When I unhook the second monitor, the temp drops to about 145° F within 4 minutes.

    I used smcFanControl to bump the Optical drive fan speed to a constant 1400rpm and the GPU temp stays at a comfortable 145° F. The GPU heatsink is above the optical drive so the air flows over it on its way out the top.
  10. portishead macrumors 65816

    Apr 4, 2007
    los angeles
    I noticed the GPU diode was at almost 190 last night. I of course have added an SSD and swapped hard drives so I am using a fan control app.

    I woke up this morning and with screen off for 7 hours, it was down to 115.

    Good tip though, I will try increasing the ODD fan a little bit when I am using the machine.

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