CDRATES  My mac was making horrible noises and this did the trick to get my fan under control.  
(Version 2.2.2)

DR. GIRLFRIEND  Ordinarily, smcFanControl is a very good app, but I'm having an issue in Snow Leopard that I'd like to make others aware of: SMCFC randomly shuts down without warning. This has happened numerous times after a reboot or after waking the computer from Sleep. It's happened on a clean install of Snow Leopard and I didn't notice until the temps were running quite high on (Original 2006 MacPro) and my fans kicked up a few decibels on their own, alerting me to the problem.

Please note: I don't this this is SMCFC's fault; I think this is a Snow Leopard bug as I've noticed other instances of the O/S not remembering various preferences (keyboard modifier keys, Wacom tablet settings, etc) or apps that I've set to open automatically at login. Hopefully Apple will have a fix soon. In the meantime, keep an eye on your system because SMCFC isn't 100% stable on Snow Leopard yet.  
(Version 2.2.2)

L0XBY  If you have an Intel iMac, I would recommend this instead:

http://www.derman.com/iMac-Fan-Control

It allows you to adjust the rate at which the fans speed up by setting the lower/upper threshold.  
(Version 2.2.2)

JERSUCH  Hi, I installed the app on my new macbookPro with core2duo processor.

when i set the settings to High RPM and saved it, it activated and i hear the fan accelerating but when it has reached 5000rpm it reduces it speed automatically back to the default macs speed.

what can i do about it?

is there a fix?

Also i only see the exhaust and no other fans, is this normal?

thx   
(Version 2.2.2)

POOHSTICK  Re. smcfancontrol: I like Apple menu menu, but found installation not so perfect. In these days of spyware, I need every reassurance of integrity, this app seems a bit tatty (hence not so confidence building). But it seems to work well.

My use is on 09 Mac Pro 8 core on Leopard 10.5.8. I find that playing any sound roasts the CPU. The smallest sound play can cook Core A up to 90C. Internet radio (Firefox or Safari) can leave temps high (this under virgin Leopard 10.5.8) until app quit. However Quicktime Player sound causes temp jump until sound stops, then temps decline.

This seems a serious MacOS bug.

Testing with 100% load on 16 cores for several minutes only got the temperature up to 61C (no smcfancontrol).

I made 3 settings for smcfancontrol, names 1, 2, 3, ... Each higher fan settings. So I can easily boost fan as temps rise.

My setting 3 is:

EXHAUST 889

INTAKE 889

BOOSTA 938

BOOTSB 800

It would be useful if i could see my setting number in the Apple menu.

Anyone have pointers to temperature limits for Nehalen CPU?

Or links to info relating to 2009 Mac Pro sound/heat problems?

I like smcfancontrol, thumbs up to developer and I hope he continues to refine it. I'd quiet like to see a graph of historical fan speeds overlaid with temps, but perhaps this is more in Temperature monitor's domain.

Of course I'd like fan speed to automatically respond to hardware temps, but that is the OS's responsibility. Apple seems buggy or weak in this area.  
(Version 2.2.2)

JIPSTER  Downloaded and tried on My Mac Mini yesterday. Works fine. The Mini is a previous generation 2.0 GHz Core 2 Duo model. Considering the form factor of the Mini, this little app will come in handy when doing some mild video converting and editing as well as just keep the Mini cooler in general.

The app does what it says and is easy to use.  
(Version 2.2.2)

CHRISALLISON3  More of a question than a comment, but

I have a late 2006 20-inch Intel iMac 2.33 GHz with 3GB of RAM. Do I need this? It sounds great, but what could be the down side? Anyway, I still downloaded it thanks!!

Any idea what I should set my fans to?

hard drive's at 1399rpm

optical 799rpm

CPU 799rpm

The fans are at the same temp as before i downloaded the software. Should I crank em up a bit? The sliders are at zero for the time being. Thanks for your help!  
(Version 2.2.2)

AVIDMCUSER  Works great. Just wondering if its normal for the fans to take a long time to spin down after changing the settings back to default values.

It is taking approximately 5 - 7 minutes for the fans to reach default speeds from maximum.

Is this a symptom of inertia or a hardware pre-programmed decline for a smoother temperature transition?

Any ideas would be appreciated.

-Aluminum iMac 24" / 2.8ghz C2D / 2gb / 300gb  
(Version 2.2.2)

LUDOMAC  I wanted to thanks the person that developed this software , it works great and solved a HUGE temperature problem i had on my MACBOOKPRO .. thanks again great job!  
(Version 2.2.2)

STILL_SPARKLING  This app is fantastic. A couple of years ago I had a bad experience with an Apple EFI Firmware Update which, after install, made the fans on my MacPro sound like a jet turbine; the sound was ceaseless and unbearable. The Apple tech who worked on my MacPro agreed that the fans were running too high. Luckily, I was still under AppleCare because he ended up replacing the entire logicboard.

Ever since then, I've used smcFanControl with great success and never touched another Apple firmware update that "adjusts fan behavior". smcFanControl lets me keep my default fan settings nice and low -- I like a quiet system -- for most tasks, but also allows me to crank the fans up, individually or globally, when needed. It also allows you to easily create and save different profiles; with these profiles you can switch, in one click, to higher or lower fan speeds when you need to adjust the cooling.

SMCFanControl is an outstanding addition to my arsenal of essential Mac apps. It's cool that it's free, but if you depend on it every day like I do, you should donate to support its development (especially with Snow Leopard right around the corner).   
(Version 2.2.2)