To test this robust power supply, we ran several tests at typical loat levels with our load tester: one at 25% load (155 watts), one at 50% load (310 watts), and one at full load (620 watts). The 50% load mark is the most likely load scenario that most users will run into with typical computer equipment. A full load scenario is only likely if a user is running an 8800 SLI setup with dual-core CPU with watercooling (and possibly a peltier). Users with extreme hardware might want to consider a 1000W PSU, as there would be more power overhead for your growing needs.
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Corsair HX620W Load Performance
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The Corsair HX620W power supply is very stable across every load level, even under extreme stress. All rails are very stable and are almost on target with their intended voltage. All of the rails varied less than 1%, although the 5V rail dipped into a 2% variance at extreme load. Since you will probably not be running this unit at full load all the time, then it is safe to say that this unit delivers extremely stable power with less than 1% variance. If you actually approach the maximum limit of this unit on a consistent basis, then you should be looking for a good 1000W power supply.
The thermal exhaust wasn’t out of control, and only raised slightly from light to full load, indicating that the quiet 120mm fan does an adequate job, and the internal components are not stressed. This unit also delivers greater than 80% efficiency, even at full load, which is a testament to the quality of this unit.
The fan was checked to verify that it was still working because it was so quiet. Even running at full load, it was impossible to hear the HX620W, so it is perfect for a home theater installation or any other quiet computing environment.
