HotHardware.Com published a new article where they evaluate the features and performance of two power supplies from OCZ and Enermax

When you begin to crave high-end dual or quad GPU configurations, you must realize that a high quality and high capacity power supply is probably in your future. Fortunately, both NVIDIA and ATI make your search for an acceptable PSU a little easier as both companies have certification programs to verify if a PSU is suitable for multiple video cards. Today, we have two beefy PSUs on the test bench, both of which have been deemed NVIDIA SLI Ready and ATI CrossFire Certified. The two PSUs are the 700W OCZ 700W GameXStream and the 620W Enermax Liberty.

700W GameXStream & 620W Enermax Liberty PSUs