The NZXT Precise 650 Watt Power Supply that Overclockers Club reviews won’t have much problems powering newer graphics cards.  Over 500W is dedicated to the 2 12V lines, so even the new 7950GX2 should get enough power.  It also cools well, though that makes it a little louder than other models.
“Precise: a word that brings most of us to the edge of our respective thrones, whether to oogle at that brand new BMW or admire a special piece of computer hardware. NZXT is bringing that sought-after “show and shine quality” you normally expect to see on new BMWs to your home with their latest 650 Watt Precise Power source. NZXT is a newcomer to the computer hardware game, established in 2004 by a group of gamers who wanted to design products aimed at the gaming community. With the release of their new line of power sources they are taking a wider stance in the market, and securing a strong foothold. The real test will not be mere appearance, but the sheer brute animal performance of this beast.”

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