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Powermac G5 high pitched noise?

N

NSiebenmor

macrumors member
Original poster
Jul 23, 2004
44
0
Savannah GA
I just bought a Powermac Dual 2.0 G5. I need to know if the noise I'm hearing is normal. There is a really high pitched constant noise that is relatively quiet except it is so highed pitched it stands out and is irritating. I'm not talking about the fan noise. Does anyone know what I'm talking about?
thanks

Nick
 
Install developer tools, then download the latest CHUD tools. When done go into system preferences there will be a new icon of a cpu, click it. When in that menu disable by unchecking "nap". See if it stops. I disabled nap when I got my G5 and it stopped all kinds of problems. My machine is perfect now.
 
FYI: Disabling nap disables the CPUs' ability to idle, which means the temperatures will rise to levels of 100% CPU load. This will prompt the cooling subsystem (aka the fans) to also kick up a notch to compensate for the heat.

If this does not bother you (I'm not implying that it should, PowerMacs are biult with high levels of tolerance), then a better alternative is to run Folding@Home, which uses idle only CPU cycles (no performace hit) to "fold" proteins for Stanford University distributed computing project. The effect of this is that the CPUs will be working @ 100% (like when nap is disabled), so there will be no noise, and as a bonus you will be helping science.
 
On my Dual 2.5ghz G5 disabling nap makes the fans quieter. I would try it and see if you like it with it off. Won't hurt nothing, if its louder (which I doubt) just turn it back on.
 
Is the noise coming through the internal speaker or are there other ones hooked up?
 
I feel like an idiot, the noise is actually coming from the crt monitor I'm using! I will try CHUD anyway to see if my fans get a little quieter. thanks for the help everyone.

NSiebenmor
 
ahh I know is it's next to impossible to sleep in the same room as my g5 enless I put it to sleep. Maby it's just cuz it's a small room but it picks away at my brain it feels.
 
NSiebenmor said:
I feel like an idiot, the noise is actually coming from the crt monitor I'm using! I will try CHUD anyway to see if my fans get a little quieter. thanks for the help everyone.

NSiebenmor
Click to expand...

read. comprehend. post.

disabling nap speeds up the fans to compensate for increased CPU temps.
 
NSiebenmor said:
I feel like an idiot, the noise is actually coming from the crt monitor I'm using! I will try CHUD anyway to see if my fans get a little quieter. thanks for the help everyone.

NSiebenmor
Click to expand...

I suspected - I've had that problem - lower your refresh rate - for some reason, on some monitors (mine's a Sony CRT 19" FD Trinitron) if the refresh is too high, it emits that really high pitched tone. I lowered mine down to 85, I think. I once had the same problem with a ViewSonic CRT as well - same problem and same fix (lowered the refresh rate down a notch).
 
MacTruck said:
No it doesn't.
Click to expand...
Err, wrong, try again

napcomparison31rv.png
 
what program is that that shows the temperatures and so forth?

and my dual 2.3ghz is quiet unless im doing heavy work. its amazing
 
mackaveli said:
what program is that that shows the temperatures and so forth?

and my dual 2.3ghz is quiet unless im doing heavy work. its amazing
Click to expand...

The program that i'm using is called Hardware Monitor. It's not free, it is about $9 US dollars (they sell from europe).
The official site is here www.bresink.de/osx/HardwareMonitor.html It's a very good program with graphing and history capabilities. Well worth the price.

Also, I'm not saying that PowerMac becomes too loud when Nap is off (or when @ 100% CPU, which is basically the same to the CPUs); all I'm pointing out that temperatures and fan speeds do increase when nap is off; and instead of disabling Nap, one can just run F@H in the background and kill the chirping and beeping (those are official terms), while helping Stanford university.
 
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