PC Power & Cooling 750w Silencer S75EPS PSU

Testing

Load Testing

In order for the results from all current and future PSU reviews to remain fair and comparable, Overclock3D uses a custom built Power Supply load stress tester.

The tester will be placing the following loads on each of the Silencer's rails:

+3.3v - 20a Load
+5.0v - 20a Load
+12v - 40a Load

The results are collected from a Mastech MAS-345 Multimeter which logs its readings via RS232 to a PC.

PCP&C 750w Silencer 3.3v PCP&C 750w Silencer 5v

Following in the footsteps of the recently reviewed Turbo-Cool 1kw, the Silencer exhibited no (yes ZERO) fluctuation on both the +3.3v and +5.0v rails. This is simply an amazing result, and something PCP&C should be very proud of.

PCP&C 750w Silencer 12v

Yet again the Silencer places its self among some of the best power supplies we've ever tested here at Overclock3D. With only 0.02v fluctuation on the +12v rail when placed under 40 amps load, this PSU is an ideal companion for those voltage sensitive graphics cards.


Efficiency Testing

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester.

The results may not be as accurate as those produced by professional testing equipment, but will certainly come in handy when comparing several power supplies against each other.

PCP&C Silencer 750w Efficiency

The S75EPS was placed under a load of 646 watts. This counts for a total of 86% of the power supplies rated output. At this load, the power supply required 779 watts from the mains to produce the 646 watts required by our custom made power supply tester. Therefore the efficiency of this power supply can be found by a simple equation: (646 / 779) * 100 that works out to be an efficiency rating of 82.9%.


Noise Testing

Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.

For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.

Idle Recording - Download
½ Load Recording - Download
Load Recording - Download

At idle I found the unit to be almost inaudible, even with my ear up close to the exhaust fan.

Increasing the load on the PSU to half of its rated output caused the fan controller to bump up the fan speed. However, at this speed the unit remained at a perfectly acceptable noise level which even a HTPC user would find hard to fault.

At full load the Silencer increased the fan speed by a significant amount, causing the noise levels to increase at the same time. Personally i would say that the noise output was on the verge of acceptable for my tollerances. It is worth remembering that the average user will find it hard to place the Silencer under this amount of stress, but in my opinion PCP&C could have chosen a better fan to cool the unit.

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Most Recent Comments

25-09-2006, 12:28:19

JN
"PC Power & Cooling are often regarded as the "Crème de la Crème" of the power supply world. Today I'll be putting their 750w Silencer through its paces to see if it lives up to their reputation."

Linky

25-09-2006, 12:35:10

ai_01
was actually hoping you'd review this psu... gj as usual.. kinda sad how loud it is.. think it would of done better with a 120mm fan. btw the forum linky at the end is broken or no linkage.

25-09-2006, 12:38:39

JN
Yeah it is a tad on the loud side when under full load. However, after speaking with someone that uses one 24/7 - it remains really quiet for them in their Conroe rig. Its just when you push past 35a on the 12v rail that it starts to pipe up the noise a bit.

IMO they could have chosen a better fan (41dba @ 12v is a bit loud), but they did a good job of keeping it quiet in most situations.

25-09-2006, 15:02:13

FarFarAway
I luff PCP&C's....mmmmmm
Reply
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