View Full Version : PPC G5 fan problem

07-11-2010, 12:56 AM
Machine Name: Power Mac G5
Machine Model: PowerMac7,3
CPU Type: PowerPC G5 (3.0)
Number Of CPUs: 2
CPU Speed: 2 GHz
L2 Cache (per CPU): 512 KB
Memory: 1.5 GB

okay so my mac keeps over heating and shutting down. here are my temps

CPU A Die temp 107 F
CPU B Die temp 106 F
Drive Bay 87 F
Backside 95 F
Heatsink idles at 140 F usually at 160 F

i know the heatsink is high and have come to the conclusion that my front inlet fans are not functioning normally. when i look at them they are spinning at a much slower rate than the other fans. thought about replacing them but dont have the money right now. anybody know of a way to adjust the fans rpm. i wanna try that first before i fork over $70 for new fans.

07-11-2010, 04:10 PM
Defiantly fix the fan if needed but...The temps you list are fine if accurate. Some G5's had problems. I never owned one. Have you used/tried any other apps to check accuracy. Like Hardware Monitor, iStat or several others some free, some pay...

Is it clean and clear of dust bunnies and cobwebs, the airflow good - not stuffed under a desk.... Any other issues with it? Any recent software or hardware changes?

See if anything in this search might help. http://www.macgurus.com/forums/search.php?searchid=374264

07-11-2010, 06:22 PM
i forgot to mention that it shutsdown when the heatsink reaches 178 F. havent tried hardware monitor yet. its all cleaned out. no hardware or system changes.i set it up so has great airflow. i have small fan blowing in it now. manages to keep the temp down but would like not to use it. can you list some software where i can change my fans rpm

07-11-2010, 08:26 PM
SMC Fan Controller Look here. (http://www.google.com/search?hl=en&q=SMC+FAN+CONTROL+G5&btnG=Search&aq=f&aqi=g1&aql=&oq=&gs_rfai=)

Advice from mods -
Don't turn just one fan way up, it disrupts the airflow in the case and will make other components get really hot. Turn all fans up proportionally.
Also since cooler is always better don't be afraid to run one a bit faster.
If you do use the SMCFanControl I recommend you increase all the fans equally (% not rpm) to the highest point that they don't bother you. One thing nice about SMCFanControl is that it only increases the minimum speed at which the fans can be set. If the built in Apple fan control decides they need to rev up for a few it will do so but when they slow down again they will not go under your setting in SMCFanControl.

I found out the hard way that increasing one fan and not increasing the others disrupts proper airflow in the case.... Yeah maxed the hard drive fan by itself and you would be STUNNED how fast a PSU can heat up when you cut off its air (**cough81˚Ccough**) Others might post their operating temps...

07-12-2010, 04:13 AM
Suggest you turn each fan all the way up by itself for only a few seconds, just to make sure that they will go up that high without any problems. Might spot a failed fan that way

07-12-2010, 02:15 PM
smc fancontrol does not work on powerpc's only intel based macs.
any one know how to adjust the fans rpm in the system files?

07-12-2010, 02:53 PM
I don't know... anything in either of these searches that might help...

Google search (http://www.google.com/search?hl=en&&sa=X&ei=UHk7TIU5ivS2A_iN0doK&ved=0CCYQBSgA&q=PPC+G5+Mac+fan+override&spell=1) or another (http://www.google.com/search?hl=en&source=hp&q=PPC+G5+Mac+increase+fan+rpm+&btnG=Google+Search&aq=f&aqi=&aql=&oq=&gs_rfai=CzVCPmHk7TLrLGoGgjgPstOyMDgAAAKoEBU_QLRTW)