PC Power & Cooling Silencer 760W Power Supply
Author: Zahn Funk
Editor: Shawn Knight
Date: 02-02-2011
Provided by: PC Power & Cooling
Pages:
Installation / Testing

I've installed the PC Power & Cooling Silencer 760 with the following hardware:

AMD 1090T X6 Phenom II BE
MSI 890FXA-GD70
2x2Gb Crucial Ballistix Tracer DDR3-1600
Swiftech H20-320 Edge
128Gb Crucial C300 RealSSD
Icy Dock 2.5" Adapter
1Tb WD Caviar Black
1Tb Hitachi Deskstar
LG 8x BD-RE 16x DVD-RW
ASUS EAH5870 V2 1G
Zalman VF3000A
Cooler Master HAF 932 AMD Edition


As I've often run into before, the 8pin EPS cable required an extension to reach all the way from the bottom power supply mount to the top of the case in the full tower HAF 932. None of the other cable lengths caused any problems, however installing the Silencer 760 did make me realize how convenient modular power supplies are. It has been a while since I've used a non-modular unit and I had to come up with some place to hide five extra cables, the +12V CPU/EPS, two unused PCI-E and one each of the SATA/MOLEX cables. I initially opted to tuck them into the bottom of the 3" drive bays where they unfortunately interfered with the front intake fan blades, and ended up leaving them hang out the back where they prevented me from getting the side panel all the way on.


Using a Kill-a-Watt meter, I measured the power usage of the system at the outlet, during both idle and load. To generate the load I used OCCT's power supply test utility, which stresses both the CPU and GPU up to 100%. With AMD Cool-n-Quiet enabled, the CPU reduces clocks and voltages at idle, similar to the power saving mode of the GPU. Thus only 106W is being used when there's very little running in the system, and up to 497W at peak load. Compared to the max continuous rating that PCP&C gives the Silencer 750W, around 65% is being utilized. Thus under "typical" load, the system should fall somewhere around that sweet spot of 50% where the power supply will be its most efficient.


With a Fluke digital multimeter, I also took voltage readings at the back of the connector under idle and load conditions. The +5V and +12V rails were pretty close to being spot on spec, and varied very little going from idle to load, nor did they fluctuate much at all when held at load. The +3.3V however was unusually higher than normal, although just as stable as the other rails. PCP&C specifies a 2% regulation and a .1V difference on the +3.3V falls outside of that tolerance, however this did not seem to cause any problems with the operation of the system.


PCP&C claims an 80Plus Silver rating for efficiency, as certified by 80Plus.org third party testing. The Silencer 760 reached 86/88/86% efficiency at 20/50/100% load, just over the minimum 85/88/85% required for Silver. Compared to the previous Silencer MkII 750 that certified Silver at 86/89/88%, the latest Silencer power supplies seem to be down slightly on efficiency. We have no capability of measuring this ourselves, however we can compare the Silencer 760 to other 750W class power supplies tested using the identical hardware configuration. These included the SilverStone Strider 750 (Gold), NZXT HALE90 750 (Gold) and OCZ Fatal1ty 750 (Bronze). As you can see from the graph, the Silencer 760 falls inline with where it should be for a Silver rated unit.

Let's wrap things up with some final thoughts and conclusion.


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