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Old Dec 14, 2012, 02:20 AM   #1
12dylan34
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Fan noise and temperatures of the new 27 inch iMac

I have the 3.4 GHz i7 version with the 680MX.

For this test, I just did a short render of a test scene in Cinema 4D that I have. This should put heavy stress on all physical and virtual cores, and a small amount of stress on the GPU.

After a solid 10 minutes of the processors going at full bore, no part of the back of this thing is even warm to the touch. Parts are about skin temp, and others, like the bottom, are cold. It sounds unbelievable, but I swear that I'm telling the truth. The max CPU temp got to about 170 degrees F, but the back never got warm. There's a fair amount of warm air blowing out of the back vents, though.

The fan through this process peaked at about 2100 RPM, which is less of a fan noise and more of just a soft "whoosh." More like just white noise. Certainly not too disturbing. It idles at about 1200 RPM, which, for all intents and purposes, is silent, even in a very quiet room. Some screenshots are attached just for fun, and to look at the temperatures as well. At idle, parts of the machine, namely the LCD proximity and the HDD, are too cold to even register with the sensor, and just have a "-" in the place of their temp.
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Old Dec 14, 2012, 02:28 AM   #2
WrrN
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Quote:
Originally Posted by 12dylan34 View Post
I have the 3.4 GHz i7 version with the 680MX.

For this test, I just did a short render of a ...
Great news. Thanks for sharing.

I see you use ClipMenu; I couldn't work without it.
What's the name of the sensor app you used?
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Old Dec 14, 2012, 02:42 AM   #3
Mac32
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Sounds great! Could you also try a test that stresses both the graphics card and CPU pretty heavily? I'm really glad I went for the i7+680mx after all, sounds like the new iMac is running cooler than previuos iMacs. Great job by Apple!
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Old Dec 14, 2012, 03:09 AM   #4
12dylan34
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Originally Posted by WrrN View Post
Great news. Thanks for sharing.

I see you use ClipMenu; I couldn't work without it.
What's the name of the sensor app you used?
The sensor app is iStat Menus. I've used it for a really long time, and it's great. It has a ton of useful features.

As for ClipMenu, I just thought that something like this would be very useful a few months ago, and googled around until I found this. It's definitely really useful.

-----------------

On a more general note, I'd love to see something that stresses the GPU simultaneously like a game. I'm not really a gamer, so I don't have any serious games (I got the 680 primarily for playback performance in After Effects and C4D), so if anyone would like to do that, I'd love to see.
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Old Dec 14, 2012, 03:32 AM   #5
joachimnb
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Could you try streaming full screen silverlight/flash content in high quality for 1 hour? I find that my Air is totally quiet while making anything intensive, except from silverlight/flash content. No matter what, the fan will just kick in making noise, even though it is asymmetrical. Though this is only the case when MBA is connected with a 27" Thunderbolt Display (which it has to drive in a very high resolution), it is still annoying when you use this setup as your television.
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Old Dec 21, 2012, 05:37 PM   #6
davidgnomo
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I just heard the whoosh noise for the first time ... it was a bit scaring, then I read this post and realized it's normal : I'am downloading my music from iTunes match to an external disk since this morning (20+ Gb), while importing all my pictures to iPhoto (almost 16 Gb) and downloading a couple of huge files from the internet ! The air sound just lasted just a couple of minutes and now it's gone : nothing compared to the terrible noise of my old laptop running ...
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Old Dec 21, 2012, 05:45 PM   #7
inwe
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Today I test my iMac (i7, 680mx) playing Guild Wars 2, and my max GPU Temp got to about 83ºC (181F)... but checking iStats Menu I saw that one senor temp is missing... Any advice?

Thank you
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Old Dec 14, 2012, 02:43 AM   #8
Blkant
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I think more than the CPU, it is the GPU that will be the real test of heat. Honestly I think a high demand game running for an hour is the best way to test it, one that demands from both CPU and GPU.

Obviously however, those are not normal circumstances, so for all general purposes its great to hear the heat factor is essentially gone. Lord knows even under moderate use my 2007 iMac has actually made a very mild burn effect on my hand just adjusting it before.
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Old Jan 27, 2013, 08:12 AM   #9
Quantum3
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Originally Posted by Blkant View Post
I think more than the CPU, it is the GPU that will be the real test of heat. Honestly I think a high demand game running for an hour is the best way to test it, one that demands from both CPU and GPU.

Obviously however, those are not normal circumstances, so for all general purposes its great to hear the heat factor is essentially gone. Lord knows even under moderate use my 2007 iMac has actually made a very mild burn effect on my hand just adjusting it before.
Ah... a heavy gamer doesn't play an hour, sleeps and hour, then it keeps playing

----------

Quote:
Originally Posted by dustbunny85 View Post
I called apple and the kid said it was fine, that new cpus run hot.
Well... you may fry your GPU in a couple of years.
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Old Jan 27, 2013, 11:22 AM   #10
steve119
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My fan finally kicked in totally after the imac crashed after a drive error using logic, I was actually a bit worried as its the first time I've heard it since getting it in December and it was really loud.
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Old Dec 23, 2012, 09:55 AM   #11
Minimalisten
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My iMac late 2012 - 27" with 3 TB - is NOT silent at 1200 rpm. It is not loud, but it is annoying.
I think I will contact Apple.
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Old Dec 23, 2012, 10:51 AM   #12
sjz88
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Originally Posted by Minimalisten View Post
My iMac late 2012 - 27" with 3 TB - is NOT silent at 1200 rpm. It is not loud, but it is annoying.
I think I will contact Apple.
Please report they tell you! Because I think they'll do nothing because there is nothing wrong with the fan. Does people not hearing it probably don't sit in a silent room. Right now there's an airplane flying somewhere 15000 ft above and I can't hear the fan anymore because of that sound.
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Old Dec 23, 2012, 11:02 AM   #13
torana355
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Please report they tell you! Because I think they'll do nothing because there is nothing wrong with the fan. Does people not hearing it probably don't sit in a silent room. Right now there's an airplane flying somewhere 15000 ft above and I can't hear the fan anymore because of that sound.
My iMac 2012 27" fan is silent in a dead silent room.
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Old Dec 23, 2012, 11:06 AM   #14
MisterKeeks
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Try a render with Cinebench- that way everyone can try it, and we can see if there are differences between the 21.5 and 27 cooling systems.
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