Pro-Clockers posted a review on the Zalman ZM600-HP Power Supply

Zalman's newest power supply is the ZM600-HP. The ZM600 is the first PSU in the HP lineup. The ZM600 boasts 600 watts of pure quiet power and is completely ATX 2.2 compliant. Those who think that the HP in the name stands for high powered or high performance (Hotpants? - Ed) would be awfully wrong. The HP stands for heat pipes, as the PSU uses these to aid in the cooling process. And the 120mm Zalman fan doesn't hurt either. Lets see if the ZM600-NP has what it takes.

Zalman ZM600-HP Power Supply Review