Mac Pro 3.1 Fan Speeds?

flyingmanatee

macrumors member
Original poster
Jan 7, 2014
74
11
Oregon
I've had my Mac Pro 2008 for years, I bought it as a refurb from Apple in mid/late 2008. Its always worked without a hitch, besides the fans reving up unusually loud unless kept in relatively cool temperatures (The Mac Pro likes the room temp below 65F). Years ago I read that the Mac Pro regulated some of its fans by wattage load and not actual tempature on XLR8yourmac but I couldn't ever verify that.

I've downloaded Macs Fan Control which allows you to config the fans manually and bypass the defaults and "safe", plus configure your own logic based on tempature ranges.

I can't find operating safe averages, but having observed it (very unscientifically) I have a generally feel for what's normal (CPUs usually are 140F-ish, Northbridge/IOH 150F, RAM dimms about 120Fish, PSU 125F-ish) but I can't find any recommended ranges.

Anyone know the safe operating ranges?
 

NOTNlCE

macrumors 65816
Oct 11, 2013
1,007
195
Baltimore, MD
I've had my Mac Pro 2008 for years, I bought it as a refurb from Apple in mid/late 2008. Its always worked without a hitch, besides the fans reving up unusually loud unless kept in relatively cool temperatures (The Mac Pro likes the room temp below 65F). Years ago I read that the Mac Pro regulated some of its fans by wattage load and not actual tempature on XLR8yourmac but I couldn't ever verify that.

I've downloaded Macs Fan Control which allows you to config the fans manually and bypass the defaults and "safe", plus configure your own logic based on tempature ranges.

I can't find operating safe averages, but having observed it (very unscientifically) I have a generally feel for what's normal (CPUs usually are 140F-ish, Northbridge/IOH 150F, RAM dimms about 120Fish, PSU 125F-ish) but I can't find any recommended ranges.

Anyone know the safe operating ranges?
Those are for sure on target for temperatures. Both my CPUs are around 144 F right now, Northbridge at 151, and RAM around 120. I'm running at minimal load at the moment, but as your CPU usage revs up, the fans will too.
 

flyingmanatee

macrumors member
Original poster
Jan 7, 2014
74
11
Oregon
Thanks, it certainly seems like the Mac Pro's fan speeds are borked. It goes into leaf blower mode even under near idle conditions. Macs Fan Control seem to bring back sanity as my fans often are running it the 2300 RPM Range at the aforementioned temperatures. I've tried an SMC reset years ago and the ol' NVRAM (PR for the oldschool) reset without any success.

At least I have a fix.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.