OCC has published a review on the Mushkin Volta 600W Power Supply

The Mushkin Enhanced Volta 600W power supply performed very well throughout testing with some impressive results. The DC voltage load regulation was excellent with very little voltage drop from zero to nearly full load and the ripple/noise levels on all the DC rails were very low, which all adds up to excellent DC quality. The efficiency and power factor could be better, but it did perform up to the levels outlined in the accompanying literature and easily met the ATX12V V2.2 specification.

Mushkin Volta 600W Power Supply Review