Excerpt: Corsair's HX520W is one of five modular power supplies in the group. The cables provide up to six Molex connectors and four SATA plugs. There are two six-pin PCI Express connectors, and the PSU is certified to work with lower-end Nvidia and AMD graphics cards in SLI and CrossFire configurations. The HX520W is one of the quietest PSUs in the group. It was almost silent at 50 per cent and 75 per cent loads, and was still very quiet at 100 per cent.