actually most liquid cooling systems i've looked at in the past are pretty solid. they don't break because they don't exactly have a lot of moving parts. you get a nice, closed system and a cooling fan and you're done.
the thing i would worry about is what happens if you have a tiny leak in your liquid cooling system. i'm sure apple's not using water in their cooling system, so you wouldn't really be able to add your own. i could see that being a problem 2+ years down the line. guess i'd get AppleCare on any tower with liquid cooling in it.
as for them cooling dual 2.5Ghz chips with liquid cooling, i'm not sure that's exactly terrible as far as news for a G5 laptop.
although the 2.5Ghz might run hot, a 1.5Ghz would be siginificantly cooler.
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