Initial testing was done with a digital volt meter by simply reading the +12v and +5v in a no load condition.  We used the old paper clip trick to jumper the green and a black ground wire on the main harness to fire up the power supply and take some basic readings.  In this no load condition the +12V reading was 12.22v and the +5v was 5.05v.  It was pleasant to see such a high reading on the +12v, no doubt when the system is put under a load this value will drop some but there appears to be lots of head room here.

We installed the In Win Commander II Bronze into a system consisting of the following components:

eVGA X58 Classified NF200 (E759)
3X2gb G.Skill DDR3 2000
i7 920
2x eVGA GTX260 video cards in SLI
DVD Rom Drive
4x IDE hard drives
Water Cooling W/MCP355 Pump and 6 additional fans

We set the CPU to a 4.0 overclock and took an initial set of readings while the system was idle. We then started up the LinX stress test and took another set of voltage readings over a 30 minute period noting the high and low values.  Once that was complete we fired up the Future Mark Vantage benchmark and noted the high and low values during the benchmark. Here are the results:

As you can see by the above results there was very little change between idle and load testing results. In fact no change at all between the LinX and Vantage tests. In Win advertises stable voltages as part of their marketing campaign for the Commander II line of power supplies, nothing we have seen would doubt their claim as the voltage rails were rock solid through everything we threw at it. It’s possible with more sophisticated testing equipment to measure other functions of the Commander II 850W under extreme load conditions, but rarely (if ever) does the average enthusiast come close to those conditions.