Now, as many as 85, 000 Apple Computer fans make a pilgrimage to the MacWorld expo, the annual four-day event at San Francisco's Moscone Center.

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Enough computer users are fed up with noisy fans and humming hard drives to fuel a whole subculture of folks who build their own silent machines.

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Eventually it gets too loud, so gamers replace fans with a water-cooling system--essentially a car radiator for their computer--which also enhances overall performance.

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