09 Mac Pro power supply at 75º Celsius

Cynicalone

macrumors 68040
Original poster
Jul 9, 2008
3,212
0
Okie land
I woke up this morning started going threw my emails, and listening to a couple of podcasts. Took a look at iStat and found the power supply at 75º C. This seems exceedingly high. This is the list of all the apps I have open this morning...
  • Safari
  • iTunes
  • last.fm
  • Mail
  • iChat
  • Address Book
Absolutely nothing processor intensive on that list. Is anyone else see's numbers like this from their power supplies? Maybe I haven't been paying attention and the iTunes/QT bug is also stressing the Power Supply?
 

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alphaod

macrumors Core
Feb 9, 2008
22,167
1,212
NYC
Can you check to see if the fan is physically working properly and nothing is obstructed? Maybe shine a flashlight in and check to see dust has accumulated?
 

alphaod

macrumors Core
Feb 9, 2008
22,167
1,212
NYC
I'm not sure… I don't seem to have the iTunes/Quicktime bug. Currently iTunes is on and I've just finished encoding a video.

FWIW here's a screenshot of mine…

Just curious… do you have dual optical drives by any chance?

I can only think of obstruction, a fail fan, or a broken thermal sensor.

 

nanofrog

macrumors G4
May 6, 2008
11,719
2
Yes two optical drives.

After 20 mintues without iTunes I'm down to 60º Celsius. So it must be the QT/iTunes bug.
What kind of load was on the PSU at this temp?

Assuming that not much else is running, that's high. Full load, it's acceptable, but not otherwise, as they're typically designed for a target of 55C for safety(the area alphaod's is hovering).
 

Cynicalone

macrumors 68040
Original poster
Jul 9, 2008
3,212
0
Okie land
What kind of load was on the PSU at this temp?
The same as before minus iTunes. Mail, Safari, Address Book, iChat, nothing that should load an 09 Mac Pro.

After 1 hour it was down to 50º just idling.

Now I have Aperture open and iTunes playing in the background and we are back up to 61º and 67º and climbing.
 

nanofrog

macrumors G4
May 6, 2008
11,719
2
The same as before minus iTunes. Mail, Safari, Address Book, iChat, nothing that should load an 09 Mac Pro.

After 1 hour it was down to 50º just idling.

Now I have Aperture open and iTunes playing in the background and we are back up to 61º and 67º and climbing.
Hard to say, without other '09 system owners posting PSU temps at idle, then with iTunes (or any other app that uses Quicktime X).

It does seem to be running hot to me though, as idle should be cooler (~45C or so ideally). The iTunes (Quicktime X) mess is odd, and it's effects on the PSU unknown. It's rather close here, given the location of the PSU (higher ambient than 25C, which is where the 45C figure is derived).

Either way, a PSU in the upper 60's C is too hot IMO. PSU's don't use heatsinks on the regs for that high a temp, even with forced air cooling. Forced air was done to reduce the heat sink costs, as fans are cheaper than the aluminum profile needed for natural convection cooling. It's expected ambient (intake air) will be higher than 25C as well, and forced air makes more sense in this case as well.
 

lannister80

macrumors 6502
Apr 7, 2009
490
17
Chicagoland
Well, under super-duper full load, my 2008 MP power supply runs at 53C and 60C (two temp probes) and never goes above that (600rpm PS fan).

Not sure how relevant that is with it being a different model, but that does seem pretty darn high,
 

nanofrog

macrumors G4
May 6, 2008
11,719
2
Well, under super-duper full load, my 2008 MP power supply runs at 53C and 60C (two temp probes) and never goes above that (600rpm PS fan).

Not sure how relevant that is with it being a different model, but that does seem pretty darn high,
The PSU's in the '08's and '09's are very similar (same power rating), so it's applicable IMO (improvements in efficiency, which means the '09's should run a tad cooler for the same load :eek:).
 

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