Testing (continued):
The 5V rail data is provided below, and again we see the PCP&C unit remain relatively flat through out the test, while the Rosewill unit drops under 5V as soon as the load is applied. Total ripple on the Rosewill unit was about 1.6%.
Next we have the 3.3V rail data, which follows the same trend as the first two rails. The PCP&C unit is unaffected by this load, but the Rosewill unit drops a bit. Total ripple on the Rosewill unit was about 0.6%.
While the results don't look bad at all, there are two other things to consider. The first is that the PC Power and Cooling power supply proved it was capable of much higher loads during its review. I feel those same loads would be too much for this Rosewill unit. It was already starting to show signs of stress as tested, and we weren't even close to 600W, according to my rough calculations. Overclock the system, and a handful of hard drives, a few high powered PCIe graphics cards, and maybe a water cooling system, and you would exceed the load provided by the Seasonic loader. At this point I am unsure I would trust that the system would remain stable.
The second thing to consider is that it took a couple tries to complete the testing on the Rosewill unit. Adding the Seasonic loader to the system while hot didn't effect the PCP&C unit at all, but the system with the Rosewill unit hung twice. The first time it happened immediately upon connection, the second time it happened about 4 minutes in. I was forced to use the reset button to reboot and try again, and on the third attempt I managed to make it through the test. It may be a bad idea to add something like the loader to a system while hot, but it is of interest since only the Rosewill unit was effected.
As a final check, the 600W Stallion was connected to a Seasonic Power Angel in order to gauge the power factor rating. Rosewill advertises active power factor correction, with a PF value of 0.99, and under load during testing the Power Angel indicated a value of 0.98. The PF value generally increases as the load increases, so if you approached 600W, I believe the advertised value would be correct.
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