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Old Jul 4, 2011, 10:52 PM   #1
gmanist1000
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27" iMac GPU Diode Temperature?

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?
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Old Jul 4, 2011, 11:22 PM   #2
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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.
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Old Jul 5, 2011, 02:33 AM   #3
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Quote:
Originally Posted by gmanist1000 View Post
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?
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.)
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Old Jul 5, 2011, 08:06 AM   #4
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Quote:
Originally Posted by gmanist1000 View Post
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?
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...
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Old Jul 5, 2011, 02:32 PM   #5
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Originally Posted by omvs View Post
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...
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.
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Old Jul 5, 2011, 05:03 PM   #6
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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.
You should turn on the AC.

Have you thought about calling Applecare?
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Old Jul 5, 2011, 05:14 PM   #7
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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.
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Old Jul 5, 2011, 05:47 PM   #8
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You should turn on the AC.

Have you thought about calling Applecare?
If we had AC I would. I haven't called them yet, if I encounter problems I will.
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Old Jul 15, 2011, 11:28 AM   #9
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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.

Last edited by WazoooGuru; Aug 19, 2011 at 09:24 AM.
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Old Jul 15, 2011, 12:02 PM   #10
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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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