Ultra Products X4 850W Modular Power Supply Review
 

While the unit did not survive the review, I won't hold that against it. As the new test setup gets refined the mortality rate will hopefully drop, while the useful information provided in these reviews will hopefully rise. Before its death, the unit put up respectable numbers in terms of regulation, ripple, efficiency, and not previously mentioned - noise output.

http://www.bigbruin.com/content/ultrax4850_1