The Aerocool E85M-550 is basically a V12XT-600 with downgraded components and less cables. It exhibits the same performance and flaws found in its big sister.
Efficiency really peaked at 85% as promised by the manufacturer, but at full load its efficiency was below 80%. This unit has 80 Plus Bronze certification, and should present efficiency of at least 82% at full load. As we always point out, Ecos Consulting, the company behind the 80 Plus certification, tests power supplies at 23° C, and we test power supplies at 45° or higher, and efficiency drops with temperature. So we believe our results to be more realistic.
Voltage regulation failed on the -12 V during our light load (20% load, meaning 110 W) test, but all other voltages were inside specs during all tests.
Although inside specs, noise and ripple were very high when the unit was delivering 550 W.
In summary, we think that there are better options on the market if you are looking for a good 550 W or 600 W power supply (e.g., the OCZ ModXStream Pro 600 W, the Cooler Master Silent Pro M 600 W, and the Huntkey Jumper 550).