Performance

The specs of the HP-580AP look very good. Four 12V rails with 20 Amps each is a lot of power. Should you exceed those 20 Amps the Rail Power feature will automatically activate to keep your system stable.


Tested on: AMD Athlon64 FX-62 @ 2800 MHz, ABIT AT8, 2x 512 MB DDR400, WD Raptor 36 GB, Radeon X1900 XTX + Radeon X1900 XTX Crossfire

While the 3.3V and 5V line stability was fine during testing, the 12 V line varied quite a bit, especially in the CrossFire load test. Don't get me wrong, the unit passed both tests just fine and the system never crashed but we can clearly see where the limits are of this 580 W power supply.


The ripple voltage was measured on the 12V line at idle. With an amplitude of only 11.4 mV from peak to peak, the ripple voltage is very low.


Standard deviation is a statistical term, which tells how far away from the average the measurements are. In other words it's the average of the average.
A large standard deviation indicates that the data points are far from the average and a small standard deviation indicates that they are close within the average.


Mushkin's HP-580AP has only about average efficiency from all the PSUs we tested so far, but even a few percent more or less will not have a big impact on your power bill.