you need a psu with enough power for gc.
if your current psu is able to support it, then go for gc first,
else, go for psu.

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Added on September 18, 2008, 10:15 ama good psu is able to support you for years without out dating.
but gc technology is refreshing now and then.
i would suggest you to get a psu then onli gc, who knows, when a new gc will come?

This post has been edited by iostream: Sep 18 2008, 10:15 AM

i believe every product comes with a manual, or at least some instructions telling you how to install it...
and there are search engines like google, yahoo, microsoft live search, etc...
and artic cooling has his website which contains everything you need to know..