2011 iMac Temperatures and Fan Speeds

MythicFrost

macrumors 68040
Original poster
Mar 11, 2009
3,932
38
Australia
Hey everyone,

Please read this entire post before replying, thank you. 2011 iMacs ONLY.

I think it would be great to have a reference for all 2011 iMac temperatures (in celsius) and fan speeds, so I've created this thread.
Can you post both your idle and/or load temperatures (both is preferable) for your 2011 iMac (in celsius). To get the information use the iStat Nano widget for Dashboard which you can get for free here: iStat Nano

In iStat Nano, get the temperatures from the “Temps” option and the fan speeds from the “Fans” option. You don’t need anything else. You can change the temperature to display in celsius if it isn't already by clicking the “i” at the top right. Example image here.

You can get your hard drive information (i.e: 500GB Hitatchi (HDS7222020ALA330)) from System Profiler in the “Serial-ATA” tab. You want the capacity and the model.

Please only use the format below for simplicity and clarity.

Format: (put quote tags around it) (these aren't real results btw):
21.5”, i5 2.5GHz, 6750M 512MB, 500GB Hitatchi (HDS722020ALA330) HDD
Idle temperatures: Ambient: 24 — HDD: 60 — CPU: 45 — GPU Diode: 65 — GPU-Heat-sink: 60 — Memory Controller: 50 — Optical Drive: 50
Idle fans: CPU: 1000 RPM — Hard Drive: 1300 RPM — Optical Drive: 1200 RPM

Load temperatures: Ambient: 24 — HDD: 60 — CPU: 55 — GPU Diode: 75 — GPU-Heat-sink: 73 — Memory Controller: 55 — Optical Drive: 54
Load fans: CPU: 1200 RPM — Hard Drive: 1500 RPM — Optical Drive: 1400 RPM
(Tested with: Portal 2)
Just copy and paste this placeholder below and fill in your details: (exactly as above please, if you don't know something, ask how to find out first, and then post with the correct details)
ScreenSize, CPU, GPU, HDD
Idle temperatures: Ambient: 0 — HDD: 0 — CPU: 0 — GPU Diode: 0— GPU-Heat-sink: 0 — Memory Controller: 0 — Optical Drive: 0
Idle fans: CPU: 0 RPM — Hard Drive: 0 RPM — Optical Drive: 0 RPM

Load temperatures: Ambient: 0 — HDD: 0 — CPU: 0 — GPU Diode: 0— GPU-Heat-sink: 0 — Memory Controller: 0 — Optical Drive: 0
Load fans: CPU: 0 RPM — Hard Drive: 0 RPM — Optical Drive: 0 RPM
(Tested with: game)
(Make sure you put quote tags around your results)

Definitions of Idle and Load (in this specific test): (quoted for easier reading)
“Idle” is light use. For example: editing text documents, web browsing (no flash games or flash video (YouTube, etc.)), no movies, and nothing process intensive for either the CPU or GPU. Give your iMac at least one hour of rest after doing anything process intensive (for the CPU or GPU), i.e: flash video, games, handbrake. This should be enough time to return to normal operating temperatures.

“Load” is heavy use. These results should only be after having played an intensive computer game for at least half an hour (required to push both CPU and GPU). Results should be written out in TextEdit as quickly as possible after finishing (within a minute or so is ideal). Fan speeds first.
Using a game over a stress test should result in only real world results, which is preferable.

Example games: Eve Online, WoW, Team Fortress 2, Counterstrike: Source, Left 4 Dead 1 or 2, Portal, Portal 2, Torchlight. Games like Plants vs Zombies don’t count. Flash games don’t count. Please make sure to list the game you used.

Final words:
It's preferable to post idle and load temperatures at the same time in one post. So, please log either your idle or load temperatures (it doesn't matter which you do first) in a text document and save it to your desktop and then log the other one, and then post here in the above format. It doesn't matter if you say, do the idle test today, save that data in a text document, and then do the load test several days later. Just post both at the same time please.
 
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MythicFrost

macrumors 68040
Original poster
Mar 11, 2009
3,932
38
Australia
Here’s the perfect example (these aren't real results btw):

Hi, here’s my results:
21.5”, i5 2.5GHz, 6750M 512MB, 750GB Hitatchi (HDS722020ALA330) HDD
Idle temperatures: Ambient: 30 — HDD: 50 — CPU: 40 — GPU Diode: 50 — GPU-Heat-sink: 48 — Memory Controller: 42 — Optical Drive: 43
Idle fans: CPU: 900 RPM — Hard Drive: 1000 RPM — Optical Drive: 1000 RPM

Load temperatures: Ambient: 30 — HDD: 52 — CPU: 55 — GPU Diode: 62 — GPU-Heat-sink: 60 — Memory Controller: 51 — Optical Drive: 47
Load fans: CPU: 1000 RPM — Hard Drive: 1200 RPM — Optical Drive: 1200 RPM
(Tested with: Portal 2)
(You would mention at the bottom right here, if you were using smcFanControl to force fan speeds to a specific speed)
 
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G4er?

macrumors 6502a
Jan 6, 2009
626
21
Temple, TX
And this is a big reason why so many of us want Apple to build the xMac. A bigger case which will allow more space between components so that heat won't be a worry.
I was close to getting a mini but now with an internal power supply that is just one more heat source packed in tight against everything.

When I started using Macs people bought them because they worked, not because they were packed like a can of sardines and were fashion statements.

Apple,
I'd pay $1500 for a mid sized computer that isn't an all in one that holds 2 hard drives plus an optical drive and has room around the parts so heat wouldn't be a concern.

I don't need the horsepower or the price of the $2499 Mac Pro just to have some peace of mind.
 

archer75

macrumors 68030
Jan 26, 2005
2,855
1,407
Oregon
27" 3.4ghz i7, 6970m 2gb 2tb hard drive Seagate ST32000541AS
Idle temperatures: Ambient: 16 — HDD: 42 — CPU: 30 — GPU Diode: 44 — GPU-Heat-sink: 39 — Memory Controller: 36 — Optical Drive: 30
Idle fans: CPU: 938 RPM — Hard Drive: 1115 RPM — Optical Drive: 998 RPM

Load temperatures: Ambient: 20 — HDD: 45 — CPU: 44 — GPU Diode: 81 — GPU-Heat-sink: 74 — Memory Controller: 46 — Optical Drive: 40
Load fans: CPU: 940 RPM — Hard Drive: 1132 RPM — Optical Drive: 1085 RPM
(Tested with: World of Warcraft)
I played for a little bit to get the temps up. I have seen the GPU peak at 83 yesterday but the ambient temps were also higher then.

Fan speeds aren't changing. I wish I could change their RPM's based upon certain temps.
 
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CBGFilms

macrumors regular
Oct 16, 2008
118
0
Here are the results for my system:
21.5", i7 2.8GHz, 6770M 512MB, 1TB WDC (WD1001FALS-403AA0) HDD
Idle temperatures: Ambient: 27 — HDD: 51 — CPU: 42 — GPU Diode: 66 — GPU-Heat-sink: 63 — Memory Controller: 56 — Optical Drive: 45
Idle fans: CPU: 1199 RPM — Hard Drive: 1099 RPM — Optical Drive: 1000 RPM

Load temperatures: Ambient: 27 — HDD: 53 — CPU: 51 — GPU Diode: 76— GPU-Heat-sink: 73 — Memory Controller: 63 — Optical Drive: 47
Load fans: CPU: 1196 RPM — Hard Drive: 1100 RPM — Optical Drive: 997 RPM
(Tested with: Minecraft)
 
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bakura

macrumors member
Jan 30, 2011
34
0
I have nearly the same temps on my iMac 27' i7 3,4 GHz. However the back of the computer is quite hot, even idle. Well, they told me it was perfectly normal and was the main goal of aluminium, however it's quite scary when you're not accustomed to that ^^.
 

sth

macrumors 6502a
Aug 9, 2006
570
10
The old world
27" 3.4ghz i7, 6970m 2gb 2tb hard drive Seagate ST32000541AS
Idle temperatures: Ambient: 16 — HDD: 42 — CPU: 30 — GPU Diode: 44 — GPU-Heat-sink: 39 — Memory Controller: 36 — Optical Drive: 30
Idle fans: CPU: 938 RPM — Hard Drive: 1115 RPM — Optical Drive: 998 RPM

Load temperatures: Ambient: 20 — HDD: 45 — CPU: 44 — GPU Diode: 81 — GPU-Heat-sink: 74 — Memory Controller: 46 — Optical Drive: 40
Load fans: CPU: 940 RPM — Hard Drive: 1132 RPM — Optical Drive: 1085 RPM
(Tested with: World of Warcraft)
That's not too bad. I expected way worse temperatures.
 

patp77

macrumors member
Jul 11, 2007
45
0
I have nearly the same temps on my iMac 27' i7 3,4 GHz. However the back of the computer is quite hot, even idle. Well, they told me it was perfectly normal and was the main goal of aluminium, however it's quite scary when you're not accustomed to that ^^.
Noticed the same thing with my 2009 i7. I swear you could cook an egg back there but then, it seems like that's the point of an aluminum case... Acts as a heatsink for the entire computer and gets heat out from the limited space inside. The 27" just gives more area to disperse heat.
 

bakura

macrumors member
Jan 30, 2011
34
0
I only have idle temperatures for the moment (unless heavy use of Aperture can be considered as load ?) :

27”, i7 3.4GHz, 6970M 1GB, 1TB Western Digital Caviar Black HDD
Idle temperatures: Ambient: 23 — HDD: 49 — CPU: 41 — GPU Diode: 55 — GPU-Heat-sink: 52 — Memory Controller: 48 — Optical Drive: 43
Idle fans: CPU: 938 RPM — Hard Drive: 1098 RPM — Optical Drive: 996 RPM
This iMac is not as quiet as I thought (well, it's very quiet, but I expected more), I can hear one of the fan quite easily. The HDD is not the most quiet one too (maybe the Seagate is more quiet ?), but I kinda like this noise so no problem for that :p.
 

MythicFrost

macrumors 68040
Original poster
Mar 11, 2009
3,932
38
Australia
I only have idle temperatures for the moment (unless heavy use of Aperture can be considered as load ?) :

This iMac is not as quiet as I thought (well, it's very quiet, but I expected more), I can hear one of the fan quite easily. The HDD is not the most quiet one too (maybe the Seagate is more quiet ?), but I kinda like this noise so no problem for that :p.
Haha no I'm afraid it doesn't, but thanks for your post :)

(If you do add load temperatures, etc., can you try and remember to edit that post above so we have them in one place, don't worry if you don't though, cheers.)
 

Kwicks

macrumors newbie
May 15, 2011
2
0
Here my temps

21.5”, i7 2.8GHz, 6770M 512MB, 1000GB Wester Digital (WD1001FALS-403AA0) HDD and 120 GB OCZ (Vertex 3 instead of superdrive)
Idle temperatures: Ambient: 27 — HDD: 47 — SSD: 128* — CPU: 41 — GPU Diode: 48 — GPU-Heat-sink: 46 — Memory Controller: 48 — Optical Drive: 45
Idle fans: CPU: 1098 RPM — Hard Drive: 1198 RPM — Optical Drive: 998 RPM

Load temperatures: Ambient: 30 — HDD: 56 — SSD: 128* — CPU: 57 — GPU Diode: 54 — GPU-Heat-sink: 52 — Memory Controller: 53 — Optical Drive: 48
Load fans: CPU: 1616 RPM — Hard Drive: 1300 RPM — Optical Drive: 2616 RPM
(Tested with: Portal 2)
*because of bad S.M.A.R.T. status of my SSD

I think my optical fan is a bit noisy under load. After replacing my optical drive with the ssd, I placed the fan sensor on top of the optical bay (case of my ssd).
But in idle mode everything seems normal.
Does the optical drive fan cool something else than the optical drive? Why is this the only fan with (much) more RPM under load compared with the CPU or HDD fan?


Update:
My optical fan goes up to 3124 RPM playing Starcraft II. Does anyone know if this might be caused by my sensor placement? The temps of the components are not that high.

Update 2:
I replaced my optical fan sensor to a cooler spot in my iMac. Now i am on 38 degree with 999 RPM in idle mode. Hope that the optical drive fan is not that important because i think i will not break the 1000 RPM because of this placement ;) Anyone knows what else than the optical drive this fan should cool?

Update 3:
OK, i think this solved my "problem". After about 20 minutes SC2 iam on 1461 RPM with my optical drive fan (45°). iMac remains pretty quiet.
 
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50548

Guest
Apr 17, 2005
5,039
2
Currently in Switzerland
I have nearly the same temps on my iMac 27' i7 3,4 GHz. However the back of the computer is quite hot, even idle. Well, they told me it was perfectly normal and was the main goal of aluminium, however it's quite scary when you're not accustomed to that ^^.
Again, it IS supposed to be hot - this is the very function of aluminum as a heat dissipating material. It would be a problem if it were NOT hot, actually...:rolleyes:
 

G4er?

macrumors 6502a
Jan 6, 2009
626
21
Temple, TX
Again, it IS supposed to be hot - this is the very function of aluminum as a heat dissipating material. It would be a problem if it were NOT hot, actually...:rolleyes:
Yes, it's a heat sink. But if the outer edge of the heat sink is so hot that you can't touch it then maybe the heat sink isn't big enough.
 

imahawki

macrumors 6502a
Apr 26, 2011
612
8
27" iMac, 3.4Ghz i7

The heat is also quite a shock to me as I'm just not used to using the case as a heat sink coming from the PC world. When I'm converting movies I can't hold my hand on the top of my screen for more than a couple seconds.
 

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marban

Suspended
Jun 13, 2011
3
0
Update 2:
I replaced my optical fan sensor to a cooler spot in my iMac. Now i am on 38 degree with 999 RPM in idle mode.

can you elaborate on which position you used for the sensor and what ssd you're using? thanks
 

Kwicks

macrumors newbie
May 15, 2011
2
0
can you elaborate on which position you used for the sensor and what ssd you're using? thanks
sure.
I attached an image where i placed the sensor. (original image copyright ifixit.com)
This was the best place i found and the fan behaves quite normally.
 

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omvs

macrumors 6502
May 15, 2011
481
11
Optical drive swapped out for a OCZ Agility 2 (hence the extra SSD temp). My optical drive sensor is stuck to the case of the SSD in roughly the same position as it was on the superdrive.

My load-example uses two processes - WoW to max out the CPU, then a popcorn video transcode to stress out the CPU - I wasn't getting enough CPU out of just WoW (76%), but with the two I'm getting 350-375%

Not sure why I don't have GPU diode, but i do have power supply 2 - maybe because I'm using iStat pro?

27", 3.1GHz i5, 2GB 6970, 1TB Seagate
Idle temperatures: Ambient: 22 — HDD: 45 — CPU: 40 — GPU Diode: ??— GPU-Heat-sink: 53 — Memory Controller: 46 — Optical Drive: 41
Power Supply 2: 55 SSD: 30
Idle fans: CPU: 939 RPM — Hard Drive: 1117 RPM — Optical Drive: 999 RPM

Load temperatures: Ambient: 20 — HDD: 43 — CPU: 62 — GPU Diode: ??— GPU-Heat-sink: 75 — Memory Controller: 55 — Optical Drive: 42
Power Supply 2: 70 SSD: 30
Load fans: CPU: 939 RPM — Hard Drive: 1166 RPM — Optical Drive: 1372 RPM
(Tested with: WoW & popcorn)
 
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cooky560

macrumors regular
Jun 8, 2011
167
0
Around
ScreenSize, CPU, GPU, HDD
Idle temperatures: Ambient: 20 — HDD: 62 — CPU: 55 — GPU Diode: 55— GPU-Heat-sink: 50 — Memory Controller: 0 — Optical Drive: 0
Idle fans: CPU: 1800 RPM — Hard Drive: 1300 RPM — Optical Drive: 1200 RPM

Load temperatures: Ambient: 30 — HDD: 68 — CPU: 70 — GPU Diode: 90— GPU-Heat-sink: 85 — Memory Controller: 0 — Optical Drive: 0
Load fans: CPU: 1900 RPM — Hard Drive: 1500 RPM — Optical Drive: 1250 RPM
(Tested with: Half-life 2 Episode 2 all settings on highest native res)
 

qap

macrumors 6502
Mar 29, 2011
389
165
Italy
My temperatures during normal usage, I'm watching TV, browsing internet, twittering etc…
 

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