The TP-750 is one of the best 750W units you can get these days.
I have to disagree with the post above saying they're just "ok" and implying they're second to a "quality" brand such as Corsair. There is no difference in quality between Antec and Corsair really. Both are top-end PSU brands with top-notch customer service.
As for what a TP-750 can support -- two Radeon 6970s or GTX 570s would be no problem. Obviously a 5970 would be no problem either, nor would a 6990 or a GTX 590 be an issue.
And good for you for replacing that awful Diablotek unit in your sig Edited by Shub - 3/26/11 at 6:43pm