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Seriously pal, when you write this-
: I have an i-Mac G5 that is so noisy that I have to wear ear plugs while using it"
I can only conclude either your iMac requires servicing, or you are just making this stuff up. I regularly render hi-definition video files with a G5 imac, and its fans are just above a whisper. Exactly what are you running when you must don the earplugs?
And, if you'd care to compare the acoustic signature of that iMac to its PC competitors of that era (circa 3 years ago), even the most diehard PC fanboy would concede comparably priced Dells, Gateways, HPs, etc SCREAM compared to iMacs. Unlike most PCs of that era, fans on the iMac speed up and down based on load, unlike those silly ATI and NVidia videocard fans that whine mercilessly no matter what you are doing. PCs would have never gotten into the business of building quieter PCs had Apple not shamed them into it, and they still lag far behind.
~gtd