PC Power & Cooling Silencer MkII 750 Watt Power Supply
Author: Frank Stroupe
Editor: Shawn Knight
Date: 08-17-2010
Provided by: OCZ Technology

Test Rig:
Intel Core i7 920 LGA 1366 processor
MSI Big Bang Series XPower Intel X58 motherboard
OCZ XMP Ready DDR-1600 6GB Triple Channel Memory kit
Sapphire Radeon HD 5850 Video Card
Sapphire Toxic Radeon HD 4870 Video Card
OCZ EliteXStream 800 Watt Power Supply
Zalman X10 Performa CPU Cooler
Ikonik Ra X10 Liquid Aluminum Full Tower (liquid cooling system not used)
Windows Vista Ultimate 64-bit

I used a pair of video cards for the build to give a little stress to the Silencer Mk II 750. Installation was simple, just pop the power supply into the case, plug in the relevant wires and hide the rest.


In lieu of having thousands of dollars of hi-tech equipment to test the power supply, I like to use a system stress program called OCCT, mainly because it makes graphs of various sensors during the stress test. An issue I have with OCCT is that for some reason it still does not like Vista, and though the test progress is charted properly, the software always reads the voltage sensors wrong. As you can see in the photos the +5v actual is 5.05v and the +12v actual is 12.04v. Actually the +12v read 12.06v about 90% of the three hours I had the multimeter connected to the power supply. OCCT, using SpeedFan to read the sensors, read the +5v as 3.63, and the +12v as 10.65v.

Though the sensor reading is wrong, we can still make use of OCCT, all we have to do is keep in mind the true voltage, any variances from that will still be shown on the chart.

For testing I used the OCCT CPU Test set to lowest priority. The reason that I set it to lowest is that while I ran OCCT, I also ran Futuremark's 3DMark Vantage, so I could run both video cards in CrossfireX while charting any voltage fluctuation.

I generally wouldn't recommend you do this with your system. Mine is a totally stable system with more than adequate cooling on a CPU that I have been working with for well over a year and have total confidence in. Most systems would lock up pretty soon into the testing anyway.

I launched OCCT then about 15 seconds later launched 3DMark Vantage. I let 3DMark run its course and launched it again about 48 minutes into the testing.

As you can see, the +12v did have a little flutter… but only of .10v, and not a constant thing. The Silencer Mk II 750 didn't bat an eye at powering both of these two video cards along with the 130 watt Core i7 920. Impressive indeed.

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