Testing the efficiency of a PSU is not very easy and it requires use of specialized hardware. The goal would be to see whether the PSU delivers efficient current to simultaneously power all the devices that are connected to the PSUs power lines.

For this review, we have just tried to load our test PC with many devices and created extensive CPU+3D workload by using 3D Mark Vantage and PC Mark Vantage. Our test PC was as follows:

• Asus P5K Premium + Intel Q9300
• 2x Asus EN9800GTX
• 2x1GB Crucial PC2-8000
• 1xWD 80JB SATA I
• 1xSeagate 80GB SATAII
• Windows VISTA 32bit SP1

All PSU ratings were monitored with Everest Ultimate Edition v3.0. The following table lists the industry wide specifications for DC Output Voltage Regulation.

After running both benchmarks, the monitored outputs showed us how much stress the PSU has taken. A summary of the results can be found at the following table:

The results indicate that the PSU performed within the standard range. On the other hand, the dual VGA setup seems to stretch the power supply and we have high variation at the +12Volts rail.