X-bit Labs checks out a bunch of ATX PSUs: A.C. Ryan Ryanpower2 CableFree ACR-PS2100 (550W), CoolerMaster RealPower RS-550-ACLY (550W), Sunbeamtech Nuuo Series SUNNU550-EUAP (550W), Ultra Products X-Finity ULT-XF500 (500W), Ultra Products X-Finity ULT-XF600 (600W), Zippy Emacs HP2-6500PE (500W) and the Zippy Emacs PSM-6600PE (600W).
I want to answer a question from our reader first. It’s not a secret there are many more brands PC power supplies are selling under than actual manufacturers of power supplies, so why don’t I name the real manufacturer for every tested product? Well, I only do so if I am absolutely sure about the name. For example, there can be the manufacturer’s native marking on the power supply’s PCB, or the UL certificate is issued in the manufacturer’s name, or the PSU looks to me exactly like some model from a company which is known to be a PSU manufacturer (you can open up power supplies from Zalman and Nexus to see they are identical to certain models from FSP Group; and no one can have any doubt that FSP is the real manufacturer of its power supplies)..