OCZ Stealth X Stream 600W Review
 

If you are in the market for a power supply in the 600W range, then this one comes highly recommended. The OCZ Stealth X Stream 600W is a great mid-range power supply, that I would recommend for all but the top end SLI and Crossfire configurations. The unit showed excellent DC voltage regulation, even at 95% of its specified maximum load. The efficiency and power factor are satisfactory, and although it did not meet its quoted minimum of 85%, it did meet the ATX 12V V2.2 required minimum level.

http://www.overclockersclub.com/reviews/oczsxs600/