Insufficient information. Please post the PSU model.
Provisionally, assuming your PSU isn't complete shit, you should be able to use any single-GPU card, including the new 5870. If you're really confident in the quality of your PSU, you could probably run two; i7 920 sli/crossfire setups typically draw just north of ~400W at the wall.
Edit: Keep in mind that the efficiency band for most PSUs is in the 30~70% load range, with the peak efficiency just around 50% load.
Last edited by Burst Cancel; Nov 25, 2009 at 02:59 AM // 02:59..
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