What is the allowable fan speeds in rpm?

Hwilensky · Hwilensky #1 (**permalink**)

04-15-2012, 09:17 AM

Hey all,

Another quick question. Using Istat nano, what is the typical fan speed for the three fans?
Since I got my 2011 iMac 21.5. My speeds are as follows:

optical 1398rpm
Hard drive 1100rpm
Cpu Fan 1200 rpm

I only have safari running, is this normal? If not what is normal?

Thanks,
Hwilensky

Raz0rEdge · Raz0rEdge #2 (**permalink**)

04-15-2012, 09:48 AM

The fans will vary in speed based on a lot of things like ambient temperature, internal component temps and load and so on..

So don't just look at the fan speed, look at the temps first..

Right now, my 27" iMac is showing:
CPU - 37 degC
HD - 37 degC
Ambient - 17 degC
Optical - 29 degC

Fan speeds:
Optical - 999 rpm
Hard Drive - 1142 rpm
CPU - 940 rpm

I have a few apps up and my system has been running for 20 days now..

Hwilensky · Hwilensky #3 (**permalink**)

04-15-2012, 11:58 AM

Thanks for the help. Here is my temps. And it has been running for 2 days, should I be worried?

Thanks,
Hwilensky

McBie · McBie #4 (**permalink**)

04-15-2012, 01:15 PM

If these temps are in Celcius then you have nothing to worry about.

Cheers ... McBie

Hwilensky · Hwilensky #5 (**permalink**)

04-15-2012, 02:35 PM

Quote:

Originally Posted by McBie

If these temps are in Celcius then you have nothing to worry about.

Cheers ... McBie

I am assuming they are. If those are the temps, then I do not need to worry about my fan's rpm being so high?

Hwilensky · Hwilensky #6 (**permalink**)

04-15-2012, 02:38 PM

Here they are in Fahrenheit.

chscag · chscag #7 (**permalink**)

04-15-2012, 02:45 PM

I use iStat Menus 3 (licensed, not freeware) so my temperatures are measured a bit differently than yours. However, for my iMac 2011 21.5" machine the fan speeds are as follows:

CPU = 1200 rpm

HD = 1098 rpm

OPT = 998 rpm

They pretty much stay that way from day to day. I don't leave my machine on all the time because of the severe weather we get here in Texas but after an 8 hour run the speeds are what I reported above.

Just make sure that the intake vents at the bottom of your display housing are free and clear. The same goes for the exhaust vent at the top of the display.

Hwilensky · Hwilensky #8 (**permalink**)

04-15-2012, 02:49 PM

So I have nothing to worry about then. My fan speeds are ok?

baggss · baggss #9 (**permalink**)

04-15-2012, 06:14 PM

Yes. You're fine.

Hwilensky · Hwilensky #10 (**permalink**)

04-15-2012, 07:17 PM

Quote:

Originally Posted by baggss

Yes. You're fine.

Thanks. I was just curious because in Razors example, my rpm's where higher then his, yet my temps were lower. Thanks baggss.

Hwilensky

Raz0rEdge #2 (permalink)
Member Since: Jul 17, 2009 Location: MA Posts: 5,846 Mac Specs: 27" i7 iMac with 16GB RAM and 1TB HDD, iPhone 3G & 4, iPod Nano 16GB, iPod Shuffle, iPad 2 16GB WiFi	04-15-2012, 09:48 AM The fans will vary in speed based on a lot of things like ambient temperature, internal component temps and load and so on.. So don't just look at the fan speed, look at the temps first.. Right now, my 27" iMac is showing: CPU - 37 degC HD - 37 degC Ambient - 17 degC Optical - 29 degC Fan speeds: Optical - 999 rpm Hard Drive - 1142 rpm CPU - 940 rpm I have a few apps up and my system has been running for 20 days now.. -- Regards ...Ashwin Be sure to read the Community Guidelines \| The more information you provide, the better answers you get, remember GIGO.
	QUOTE Thanks

McBie #4 (permalink)
Member Since: Apr 26, 2008 Location: Belgium Posts: 1,838 Mac Specs: 2008 MBP 17" - 10.8.2 & iPad - iOS 5.1	04-15-2012, 01:15 PM If these temps are in Celcius then you have nothing to worry about. Cheers ... McBie " Everything should be made as simple as possible, but not one bit simpler. " A. Einstein The problem is not the problem. The problem is your attitude towards the problem. You understand ?
	QUOTE Thanks

chscag #7 (permalink)
Member Since: Jan 23, 2008 Location: Fort Worth, Texas Posts: 32,017 Mac Specs: 21.5" iMac 2.5 GHz i5, iPad 3rd Gen., 3 iPods	04-15-2012, 02:45 PM I use iStat Menus 3 (licensed, not freeware) so my temperatures are measured a bit differently than yours. However, for my iMac 2011 21.5" machine the fan speeds are as follows: CPU = 1200 rpm HD = 1098 rpm OPT = 998 rpm They pretty much stay that way from day to day. I don't leave my machine on all the time because of the severe weather we get here in Texas but after an 8 hour run the speeds are what I reported above. Just make sure that the intake vents at the bottom of your display housing are free and clear. The same goes for the exhaust vent at the top of the display. Community Guidelines
	QUOTE Thanks

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What is the allowable fan speeds in rpm?

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Hwilensky #1 (permalink)
Member Since: Mar 05, 2012 Posts: 155	04-15-2012, 09:17 AM Hey all, Another quick question. Using Istat nano, what is the typical fan speed for the three fans? Since I got my 2011 iMac 21.5. My speeds are as follows: optical 1398rpm Hard drive 1100rpm Cpu Fan 1200 rpm I only have safari running, is this normal? If not what is normal? Thanks, Hwilensky
	QUOTE Thanks

Hwilensky #8 (permalink)
Member Since: Mar 05, 2012 Posts: 155	04-15-2012, 02:49 PM So I have nothing to worry about then. My fan speeds are ok?
	QUOTE Thanks

baggss #9 (permalink)
Member Since: Oct 10, 2004 Location: Margaritaville Posts: 10,306 Mac Specs: 27" 3.4 Ghz i7 iMac-13" C2D Macbook-OSX 18.8.2-64Gb iPad 2-32 Gb iPhone 5-ATV 2-14Tb of Storage	04-15-2012, 06:14 PM Yes. You're fine.
	QUOTE Thanks

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