PC Power & Cooling Silencer 910W ATX PSU

Simulated Load Testing

Simulated Load Testing
 
To provide accurate and consistent results in all of our PSU testing, Overclock3D uses professional grade DC electronic load equipment capable of placing a sustained load of 3690w across a total of six rails (including +5vsb and -12v) on the PSU! This is achieved by using a combination of SunMoon and Analogic electronic load equipment which allow us to adjust amperage loads in increments as small as 0.01A while also measuring voltage and wattage readings on-screen.
 
During today's tests, we will be placing the PC Power & Cooling Silencer 910 under 25%, 50%, 75% and 100% load levels at both room temperature and inside a hot box regulated to a temperature of around 50°C. Additional 'Cross Load' and a 'Max Load' tests will also be performed under these conditions to simulate how the PSU reacts to heavily uneven loads as well as running above its specified output.
 
PCP&C Silencer 910W @ Room Temperature
   +3.3v  +5.0v  +12v  +5vSB  -12v  AC Watts /
 DC Watts
 Efficiency  Intake /
 Exhaust
Δ Temp
Test 1
(Low)
4.37A 4.37A 15.00A  0.75A  0.20A  257w /
227w
 88.32% 26.4°C /
33.6°C
7.2°C
3.40v 5.13v 12.29v 5.11v  -12.24v
Test 2
(Med)
8.75A 8.75A 30.00A 1.5A  0.40A  497w /
454w
 91.34%  28.7°C /
40.7°C
12.0°C
3.39v
5.12v
12.25v 5.07v  -12.27v
Test 3
(High)
13.12A 13.12A 45.00A  2.25A  0.60A  741w /
679w
 91.63%  28.4C /
42.3°C
13.9°C
3.38v 5.10v 12.20v 5.03v -12.33v
Test 4
(Full)
17.50A 17.50A 60.00A 3.00A  0.80A 1003w /
903w
90.02%  28.0°C /
42.5°C
 14.5°C
3.37v 5.09v 12.16v 4.99v -12.34v
Test 5
(x-load)
17.50A 17.50A 1.00A 0.00A 0.00A  194w /
160w
82.47% 26.2°C /
32.1°C
5.9 °C
3.38v 5.10v 12.29v 5.13v -12.71v
Test 6
(x-load)
 1.00A  1.00A  76.60A  0.00A  0.00A  1036w /
911w
87.93%  27.3°C /
41.8°C
 14.5°C
3.39v 5.13v 12.16v 5.10v -14.47v
Test 7
(MAX)
 20.00A  20.00A 75.12A  4.50A  0.60A  1201w /
1084w
86.03%  27.8°C /
46.4°C
 18.6°C
3.37v 5.08v 12.12v 4.93v -12.39v
 
The Silencer 910 gets off to a good start with a show of solid voltage stability during the standard load tests(1-4) across all rails. If I wanted to be picky I could say that it would have been nice for PCP&C to set the idle voltages a tad lower as 3.40v and 12.29v is beginning to push on the 'high' side - even though it is of course WELL within ATX specs. The cross-load tests (5 & 6) are also handled reasonably well with the only worrying output being the -12v rail. ATX specs give this rail a tollerance level of ±10%, but in test 6 this manages to hit -14.47v obviously falling well outside of spec. However, as I've said many times before, these cross-load scenario's are highly unlikely to be seen in normal usage so this really isn't so much of a problem.
 
Efficiency is also very good across the board with the unit managing between 88-90% in all of the standard tests and anything from 82% to 87% in our custom cross-load and max load tests. This obviously helps to keep temperatures inside the unit at manageable levels (with less energy being wasted as heat) and in most cases the delta between Intake and Exhaust temperatures rarely exceeds 14°C.
 
PCP&C Silencer 910W @ 50c
   +3.3v  +5.0v  +12v  +5vSB  -12v  AC Watts /
 DC Watts
 Efficiency  Intake /
 Exhaust
Δ Temp
Test 1
(Low)
4.37A 4.37A 15.00A  0.75A  0.20A  257w /
227w
 88.32% 52.0°C /
58.1°C
6.1°C
3.40v 5.13v 12.29v 5.10v  -12.24v
Test 2
(Med)
8.75A 8.75A 30.00A 1.5A  0.40A  500w /
454w
 90.80%  51.6°C /
57.8°C
6.2°C
3.39v
5.12v
12.25v 5.07v  -12.27v
Test 3
(High)
13.12A 13.12A 45.00A  2.25A  0.60A  752w /
679w
 90.29%  51.8C /
58.8°C
7.0°C
3.38v 5.10v 12.19v 5.02v -12.34v
Test 4
(Full)
17.50A 17.50A 60.00A 3.00A  0.80A 1007w /
899w
89.27%  51.1°C /
65.9°C
 14.8°C
3.37v 5.09v 12.16v 4.98v -12.45v
Test 5
(x-load)
17.50A 17.50A 1.00A 0.00A 0.00A  196w /
160w
81.63% 52.3°C /
58.4°C
6.1 °C
3.39v 5.10v 12.29v 5.13v -12.72v
Test 6
(x-load)
 1.00A  1.00A  76.60A  0.00A  0.00A  1052w /
911w
86.59%  51.7°C /
68.3°C
 16.6°C
3.39v 5.13v 12.16v 5.10v -14.47v
Test 7
(MAX)
 20.00A  20.00A 75.12A  4.50A  0.60A  1273w /
1093w
85.86%  52.8°C /
74°C
 21.2°C
3.37v 5.08v 12.08v 4.91v -12.41v
 
Re-running the tests again, only this time with an ambient temperature of 50°C really put the cooling inside the Silencer to the test. Normally I wouldn't comment on the noise output of the unit as the load testing equipment is kitted out with numerous large 240v fans that can easily drown out the sound of Metallica playing live in the next room. However, in tests 4, 6 and 7 the 'Silencer' ramped up the fan speed so much that it was clearly audible above the load testers. Silent? I think not.
 
Aside from the noise, very little changed in any of the other departments. Efficiency dropped by an average of 1% across the board and voltages dropped by 0.01-0.02v. So it's quite clear to see that the Silencer is well equipped for delivering its full 910w load (and above) in the Sahara desert if needed.
 
One final thing to note before I move on is just how powerful that 12v rail is. Although not an official test I pushed the rail as far as it would go before the PSU powered down. 90A was the magic number. Impressive indeed.
 
PCP&C Silencer 910w Scope Results @ 50°C
   +3.3v  +5.0v  +12v
Test 1
(Low)
T1_3.3V T1_5V T1_12V
Test 2
(Med)
t2_3.3v t2_5v t2_12v
Test 3
(High)
t3_3.3v t3_5v t3_12v
Test 4
(Full)
t4_3v t4_5v t4_12v
Test 5
(x-load)
t5_3.3v t5_5v t5_12v
Test 6
(x-load)
t6_3.3v t6_5v t6_12v
Test 7
(MAX)
T7_3.3 T7_5 T7_12
 
For the last part of the testing I analysed the ripple on the +3.3, +5 and +12v rails using a Rigol 25Mhz 400MSa/s oscilloscope. All readings were taken while the Silencer 910 was installed inside the 50°C hot box to provide us with worst case scenario results.
 
And here are some interesting results indeed! Keeping in mind that ATX spec states that DC output noise/ripple should remain below 50mV(pp) on the +3.3v / +5v rails and below 120mV(pp) on the +12v rail it's not long at all before the Silencer 910 falls outside of specification. By test 3 the +3.3v rail is at 62mV and the +5v rail at 74mV with the +12v rail just about managing to say inside spec at 104mV. When running at a full 911w load in test 4 the +12v rail also goes outside of spec hitting 146mV with the other rails also increasing significantly too.
 
This is not what I was expecting from PCP&C at all. Convinced something else was amiss somewhere else in the test setup, I swapped out the Silencer with another PSU tested earlier in the week to see if the results differed from the original ones. They didn't. OK so it's not the load testing equipment, maybe its a faulty cable on the Silencer? Nope. As far as I could see, all cables and connectors appeared to be fine and connected well to the load tester.
 
So who knows. I refuse to believe that these are the actual results having seen much cleaner results from JonnyGuru. But then again these occasional spikes which are bumping up the Vpp results up might not be something that every scope will pick up on. I've asked PCP&C for some insight but as yet have not received a response. Faulty PSU, faulty results, interference from alien life forms. Who knows.
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Most Recent Comments

10-07-2009, 11:02:38

JN
"PCP&C have always been an enthusiasts favourite. But does their latest 910W model have what it takes to keep up with the competition?"

http://www.overclock3d.net/gfx/artic...204741684s.jpg

PC Power & Cooling Silencer 910W ATX PSU

10-07-2009, 11:05:35

tinytomlogan
Just goes to show quite how good Corsairs are now..........

10-07-2009, 11:31:15

w3bbo
I refuse to stick a PSU in my build that does not take advantage of a 120mm fan as a minimum. 80mm is ridiculous. Noise is at a premium and with so many PSU's catching up (and indeed bettering) the PCP&C insternals, I cannot see why anyone would plump for one of these other than fanboys.

Gr8 review m8.

10-07-2009, 12:20:44

JN
Cheers guys.

I think the main problem is that PCP&C are trying to enter a market their PSU's were never originally designed for. Yet at the same time they won't let go of their morals surrounding 80mm / hard-wired design because it's what has always worked best for the server market.

10-07-2009, 12:24:13

Rastalovich
EDIT: Ah, ignore that, the problem wasn't related.

Great review. Some crazyness on the voltage qualities despite the large power they can supply.

For the cash, and in particular the name, I'd expect more from them.

I kinda feel these are the same builds as the 500w classic ones they do, only stretched, perhaps this is their max.

11-07-2009, 05:52:37

VonBlade
Amazing ... in a disbelieving style. It's like Rolls Royce producing a 6k shopping car, or Ferrari producing a supercar that only does 75mph.

Corsair seem to be dominating the market right now. Although the Coolermaster M1000 is still fighting fit.

PCP&P I am outstandingly disappointed.

11-07-2009, 06:50:53

Datamonkey
Nice review mate,

As W3bbo pointed out, why are they still making PSU's with 80mm fans!! its shocking really. Wonder if they will get back to you re: the power issues.

11-07-2009, 17:39:31

cjone2
I have the 750w version of this its a shame this doesn't live up to the same standard

02-08-2009, 00:03:58

tonschk
I bought this PC Power&Cooling and I am very happy with this 910W PSU , I plan to swap the ball bearing fan with sleeve bearing fan lubricated ( by myself ) with a creamy Zirconium grease , even a 80mm sleeve bearing fan ( of good quality ) at low RPM speed is inaudible , and the hardware inside my PC only need 150W at full load , therefore inside my case this PSU will be running all the time fresh and cool and extreme silent at very low load

I am here in Europe with 220Volts electricity, therefore the efficiency of this 80+ Silver PSU will be even more higher

06-12-2009, 09:02:43

tonschk
Update , my lovely PC Power & Cooling 910W fanless installed in my 90degrees rotated CM590 case

the two 140mm exhaust fans installed on the roof of the case will suck air through every hole/grill at the bottom of my case ,therefore the I can keep the PSU fanless
Reply
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