How much noise? G5

Specs. pasted in below.
I'm not sure about this. The noise level from my iMac is just above what I guess is OK? But how can I know. Normally I'm sitting quite and working and the loud humming can't pass my attention.
Some have said that their iMac is almost totally silent and maybe I'm comparing to this. Is a humming OK? I called Mac support in my country, and they couldn't say anything in general about noise. Asked me to reset PROM and so on. I already tried this so I kind of knew it wouldn't help. My biggest problem is that I have nothing to compare with.
Some numbers (Normal working conditions. Idle mode)
CPU fan: 799 rpm
Hard drive fan: 1399
Optical drive fan: 799
Some have said that this iMac should be very quiet but I guess thats a matter of definition. Does some of you have a similar Mac? How much does it say?
Model Name: iMac
Model Identifier: iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: IM51.0090.B09
SMC Version: 1.9f4
----------------------------------------------------

Yu have an intel Mac and have posted i the G5 iMac area. However, I have an intel iMac and it is perfectly silent, much, much quieter than my G5. I have a friend with the same model, and she has a slight hum coming from her machine, so I suppose a very modest sound is ok. You are probably within normal parameters, but try calling Apple and when you talk to the tech, hold the phone next to your machine and test if he can hear it. When I did that with my old G5, Apple replaced it because they realized the fans were abnormally loud.

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