Power Supply Roundup: 730W to 900W

Voltage Ripple and Noise

Amacrox

Antec

Cooler Master

Hiper 730

Hiper 880

OCZ

Seasonic

Silverstone

None of the units exhibit very high ripple noise, though we still see differences. Amacrox in particular generates a good results with just up to 30mV on the 5vsb rail and less than 10mV on all others. Unfortunately, we can't report results for the Hiper 770W unit since we took it apart for further inspection before we could perform the o-scope tests. The other three units performed quite well and the 730W version in particular delivers no more than 8mV on the various rails.

Antec shows minor problems on the 5Vsb rail as well since it goes slightly out of spec, but the other rails are within spec. The Cooler Master M850 is good on the 12V rails, though 12V2 and V3 are showing strangely high results of up to 80mV. OCZ also shows minor flaws on most of the rails where we see peaks up to 80mV at higher load. This might sound high but it's still within specs and not much to worry about. Seasonic could perform better, since the results for the X900 are not worthy of a high-end unit like this. Throughout the test the X900 generated ripple of up to 40mV on the 5V rail, and the 12V rails don't look much better. Finally, at maximum load the Silverstone OP850 shows 36mV on the single 12V rail and also high ripple on the lower 3.3V and 5V rails.