Cooler Master Silent Pro 1200W Power Supply Review

paulktreg - 2010-06-14 12:19:57 in Power Supplies
Category: Power Supplies
Reviewed by: paulktreg   
Reviewed on: July 25, 2010
Price: $269.99

Introduction:

Cooler Master has been producing a range of cooling products and accessories for the PC enthusiast market for over ten years now. Its main manufacturing plant in Taiwan carries ISO 9001 accreditation that demonstrates a certain commitment to quality, which is seen throughout its product range. Cooler Master has now gone global with two further manufacturing plants in China and offices worldwide. Its product range now includes CPU and chipset coolers, PC enclosures, power supplies, case fans, and accessories that include products from laptop coolers to high performance coolant.

Most PC enthusiasts will be aware of Cooler Master's highly regarded PC enclosures - the HAF 932 or CM 690 being two fine examples. However, this time around, OCC will be looking at one of its power supplies, the Cooler Master Silent Pro Gold 1200W. This will be the first Cooler Master power supply I have looked at for OCC and if I’m being totally honest, I’ve always regarded its power supplies as good, but not quite up there with the likes of Corsair, Thermaltake, PC Power & Cooling, and other top brands. Nevertheless, its reputation does seem to have improved dramatically of late. Let’s put the Cooler Master Silent Pro Gold 1200W through its paces and see how well it performs.

Closer Look:

The packaging of the Cooler Master Silent Pro 1200W, with its gold and black theme, is quite striking. The lid of the box is metallic gold in appearance with the power supply model and wattage along with Cooler Master and 80 Plus Gold logos effectively displayed in black text. The base of the box carries all the important stuff, which includes the power supply specification, an output specification table, graphs to illustrate the fan noise levels and efficiency, and logos of all the agency approvals. The base also describes some of the patented technology used in the Cooler Master Silent Pro Gold 1200W, which includes HTT, Hyper Path and Hybrid Transformer, all illustrated with a small graphic and brief explanatory paragraph.

 

 

 

 

 

 

 

 

 

 

 

The identical front and rear panels of the box are this time in black with gold text and carry the same information as the top, with the addition of NVIDIA SLI Ready and five year warranty logos.

 

The end panels carry a Cooler Master logo with power supply wattage, the short sentence “Silence is Golden”, the model number, and an invitation to visit the Cooler Master website for more information in several different languages; so many different languages - eighteen in all - illustrating Cooler Master products' global availability.

 

 

Lift the lid and you'll find that foam encases the power supply with room to the right for the accessories neatly stored in a gold cardboard enclosure. Remove the foam cover and the power supply sits protected in the middle of the box with the captive cable set stored at the opposite end to the accessories.

 

 

The power supply is enclosed in a plastic bag along with the full set of accessories, which include a sleeved user manual, UK power cord, power supply mounting screws, and modular cable bag bearing the Silent Pro Gold logo.

 

 

The Cooler Master Silent Pro Gold 1200W power supply sits well protected at the center of the box and comes with an adequate set of accessories, although a few cable ties would have been welcome. Nevertheless, this is all you need for a successful installation, so let’s move on.

Closer Look:

The Cooler Master Silent Pro Gold 1200W power supply is finished off with a satin, slightly textured, matt black paint that offers a certain level of resistance to scratching and fingerprints.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The rear face of the power supply has an IEC mains input connector with a Cooler Master logo underneath, mains on/off switch, and a large hexagonal-holed exhaust grill. The front panel carries the modular cable connector panel that consists of two PCI-E and five peripheral cable connectors. Two small pin-out diagrams underneath the cable exit port show the voltages on the modular cable connector pins.

 

 

The side panels carry identical 1200W Silent Pro Gold logos, although it’s inverted on the opposite side to the one in the photograph.

 

The top of the power supply shows the specification label with information on maximum rail loading, agency approval logos, and some cautionary notes advising against opening up the power supply and exposing the hazardous voltages inside. A large 135mm fan is used for cooling, which is shielded with a gold wire frame grill with the Cooler Master logo at its center.

 

 

The captive cable set consists of a 20+4-pin motherboard connector, two 4+4-pin ATX12V/EPS12V connectors, and a total of four PCI-E connectors - two 6+2-pin and two 6-pin. Cooler Master has used one cable set for two PCI-E connectors by branching a 6-pin PCI-E connector of a 6+2-pin PCI-E connector - a configuration I don’t like to see on high end power supplies. What I do like to see, however, is cable sleeving that goes all the way into the power supply - it does improve the overall appearance of the power supply. The modular cable set consists of two PCI-E cables with two connectors on each, three SATA connector cables, and two 4-pin peripheral connector cables, one of which has a single floppy connector. All the power supply end connector plugs are gold to match the modular cable sockets on the power supply to avoid confusion during installation.

 

 

The large 135mm black cooling fan is a DFS132512H by Young Lin, rated at 12V, 30W. The printed circuit board is tidy and well laid out and makes use of large aluminium heat sinks with plenty of surface area to improve heat loss. There are a couple of boards stood vertically that would appear to be DC to DC converters for the 3V3 and 5V0 rails - every little bit helps in the drive for higher efficiency.

 

 

Patented technology used by the Cooler Master Silent Pro Gold 1200W power supply includes HTT, Hyper Path and Hybrid Transformer. HTT is the use of an L-shaped heat sink that can be seen in the photographs. According to the literature, in combination with superb ventilation, HTT removes heat waves from the power supply. Hyper Path and Hybrid Transformer are technologies that combine components, integrated circuits, and heat sinks with the transformers to improve efficiency. The smaller of the two heat sinks shown in the photograph is physically connected to the transformer underneath it - this is the Hybrid Transformer. The extra help given by the heat sink enabled a reduction in transformer size of 25% and increased efficiency. If you look carefully at the smaller heat sink, there are a couple of temperature sensors held in place by heat shrink sleeving and I’m pretty sure one of these sensors will be used to control the fan speed - the other is probably for temperature compensation in the control circuitry. I couldn’t see a manufacturer for the electrolytic capacitors, but they are rated at the more welcome 105 °C maximum working temperature.

 

 

The build quality of the Cooler Master Silent Pro Gold 1200W power supply is excellent. Take this in combination with sturdy packaging that offers great protection, an adequate set of accessories, and great looks, and all's well so far, so let’s see how it performs.

Specification:

 

Review Sample: Cooler Master Silent Pro Gold 1200W Power Supply, Part Number RS-C00-80GA-D3.


Ratings Table:

 

 

 

 

 

 

 

 

 

 

 

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Supply Specification Table
AC Input
100-240V     12.5-6A     50-60Hz
DC Output
+3V3
+5V
+12V
-12V
+5VSB
Maximum Load
22A
25A
98A
0.3A
3.5A
Maximum Combined
Wattage
150W
1176W
3.6W
17.5W
1200W

 

System Protection:

No specific figures are available, but the following protection is built in according to the user manual.

OVP, UVP, OCP, OPP, OTP & SCP.

 

Safety & Agency Approvals:

The following safety and agency approvals are listed in the user manual.

TUV, GOST, CE, C-Tick, UL, BSMI, CCC, FCC & KCC.

 

Power Supply Physical Characteristics:

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Supply Physical Characteristics
Weight
Length
Width
Height
6.2lbs/2.8kg
7.1"/180mm
5.9"/150mm
3.4"/87mm

 

Power Supply Connectors:

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Supply Connectors
Connector Type
Qty
Motherboard 20+4-Pin
1
ATX12V/EPS12V 4+4-Pin
2
PCI-E 6+2-Pin
4
PCI-E 6-Pin
4
SATA Power 15-Pin
9
Peripheral 4-Pin
4
FDD 4-Pin
1

 

Power Supply Cable Lengths:

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Supply Cable Set
Cable Type
Cable Length/Connector Spacings
Qty
Captive
PSU > 20" > Motherboard 20+4-Pin
1
Captive
PSU > 24" > ATX12V/EPS12V 4+4-Pin
2
Captive
PSU > 24" > PCI-E 6+2-Pin > 4" > PCI 6-Pin
2
Modular
PSU > 24" > PCI-E 6+2-Pin > 4" > PCI 6-Pin
2
Modular
PSU > 18" > SATA > 4" > SATA > 4" > SATA
2
Modular
PSU > 18" > Peripheral > 4" > Peripheral > 4" > FDD
1
Modular
PSU > 18" > Peripheral > 4" > Peripheral
1

 

Features:

No feature list given on the box or in the manual. The following is taken, word for word, from the website.

 

All information courtesy of Cooler Master @ http://www.coolermaster-usa.com/product.php?product_id=2999

Testing:

For more information on how we test our power supplies, please browse our testing methodology.

Electrical Safety:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electrical Safety Test Class 1
Manufacturer/Model
Pass/Fail
Cooler Master Silent Pro Gold 1200W
Pass

 

Short Circuit Protection:

I short circuited the 3V3, 5V0 and 12V rail in turn. The power supply did shut down, and once the short was removed and the unit switched off for at least one second, resumed normal operation. Although listed here at the beginning of the testing section, I tend to leave this test until the very end, in case it doesn't quite go as planned.

 

DC Output Voltage Load Regulation:

 

Mains Input Voltage 110VAC

 

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 110Vac/50Hz
PSU DC Rail
Measured Voltage(V)
3V3
3.38
5V0
5.10
+12V
12.24
-12V
11.65
5VSB
5.11
Total PSU DC Loading = 0W (0% of Rated Maximum Output Power)

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 110Vac/50Hz
PSU
DC Rail
Rail Loading Amps (A)
Rail Loading Watts (W)
Measured Voltage (V)
ATX12V V2.2 Limits (V)
Pass/Fail
+3V3
3.18
10.68
3.36
3.135 – 3.465
Pass
+5V
5.08
24.23
5.08
4.75 – 5.25
Pass
+12V
15.76
192.43
12.21
11.4 – 12.6
Pass
-12V
0.32
3.62
11.3
10.8 – 13.2
Pass
+5VSB
2.16
10.78
4.99
4.75 – 5.25
Pass
Total PSU DC Loading = 242W (20% of Rated Maximum Output Power)

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 110Vac/50Hz
PSU
DC Rail
Rail Loading Amps (A)
Rail Loading Watts (W)
Measured Voltage (V)
ATX12V V2.2 Limits (V)
Pass/Fail
+3V3
3.15
10.36
3.29
3.135 – 3.465
Pass
+5V
4.77
23.85
5.00
4.75 – 5.25
Pass
+12V
44.70
541.76
12.12
11.4 – 12.6
Pass
-12V
0.34
3.90
11.48
10.8 – 13.2
Pass
+5VSB
2.13
10.39
4.88
4.75 – 5.25
Pass
Total PSU DC Loading = 590W (49% of Rated Maximum Output Power)

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 110Vac/50Hz
PSU
DC Rail
Rail Loading Amps (A)
Rail Loading Watts (W)
Measured Voltage (V)
ATX12V V2.2 Limits (V)
Pass/Fail
+3V3
7.94
26.36
3.32
3.135 – 3.465
Pass
+5V
9.40
47.47
5.05
4.75 – 5.25
Pass
+12V
88.27
1073.36
12.16
11.4 – 12.6
Pass
-12V
0.35
4.08
11.65
10.8 – 13.2
Pass
+5VSB
2.14
10.59
4.95
4.75 – 5.25
Pass
Total PSU DC Loading = 1162W (97% of Rated Maximum Output Power)

 

Mains Input Voltage 230VAC

 

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 230Vac/50Hz
PSU DC Rail
Measured Voltage(V)
3V3
3.37
5V0
5.09
+12V
12.25
-12V
11.60
5VSB
5.10
Total PSU DC Loading = 0W (0% of Rated Maximum Output Power)

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 230Vac/50Hz
PSU
DC Rail
Rail Loading Amps (A)
Rail Loading Watts (W)
Measured Voltage (V)
ATX12V V2.2 Limits (V)
Pass/Fail
+3V3
3.17
10.65
3.36
3.135 – 3.465
Pass
+5V
4.76
24.23
5.09
4.75 – 5.25
Pass
+12V
15.75
192.46
12.22
11.4 – 12.6
Pass
-12V
0.33
3.75
11.36
10.8 – 13.2
Pass
+5VSB
2.15
10.62
4.94
4.75 – 5.25
Pass
Total PSU DC Loading = 242W (20% of Rated Maximum Output Power)

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 230Vac/50Hz
PSU
DC Rail
Rail Loading Amps (A)
Rail Loading Watts (W)
Measured Voltage (V)
ATX12V V2.2 Limits (V)
Pass/Fail
+3V3
3.16
10.62
3.36
3.135 – 3.465
Pass
+5V
4.73
24.07
5.09
4.75 – 5.25
Pass
+12V
44.79
547.33
12.22
11.4 – 12.6
Pass
-12V
0.34
3.90
11.46
10.8 – 13.2
Pass
+5VSB
2.14
10.63
4.97
4.75 – 5.25
Pass
Total PSU DC Loading = 597W (50% of Rated Maximum Output Power)

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) DC Output Voltage Load Regulation
Supply = 230Vac/50Hz
PSU
DC Rail
Rail Loading Amps (A)
Rail Loading Watts (W)
Measured Voltage (V)
ATX12V V2.2 Limits (V)
Pass/Fail
+3V3
7.90
26.23
3.32
3.135 – 3.465
Pass
+5V
9.47
47.82
5.05
4.75 – 5.25
Pass
+12V
88.25
1073.12
12.16
11.4 – 12.6
Pass
-12V
0.35
4.08
11.66
10.8 – 13.2
Pass
+5VSB
2.14
10.57
4.94
4.75 – 5.25
Pass
Total PSU DC Loading = 1162W (97% of Rated Maximum Output Power)

 

The -12V rail goes a little lower than I'd like, but it still remained well within the ATX12V V2.2 specification at all times. The Cooler Master Silent Pro Gold 1200W DC output voltage load regulation is otherwise on a par with other power supplies in its class. No problems, so let's move on.

Testing:

Efficiency and Power Factor:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Factor & Efficiency
Supply = 110Vac/50Hz
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
16
0.46
N/A
N/A
242
284
0.96
85
Pass
590
686
0.98
86
Pass
1162
1421
0.98
82
Pass

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Power Factor & Efficiency
Supply = 230Vac/50Hz
DC Load (W)
AC Load (W)
PF
Efficiency (%)
Pass/Fail
0
16
0.32
N/A
N/A
242
282
0.90
86
Pass
597
682
0.94
87
Pass
1162
1385
0.96
84
Pass

 

The Cooler Master Silent Pro Gold 1200W scored some decent figures for efficiency, following the OCC power supply testing methodology, although it didn't quite reach the requirements of 80 Plus Gold certification. The 80 Plus Gold standard requires efficiency levels of 87%, 90% and 87% efficiency at 20%, 50% and 100% DC loading, respectively, with a power factor >0.9 at 50%. The required power factor is easily reached, but the overall efficiency levels are a little low, with a noticeable dip at full load. The efficiency easily meets the requirements of the ATX12V V2.2 specification and, although gold levels aren't reached following the OCC power supply testing methodology, maximum efficiency is in the high eighties.

 

AC Ripple On DC Outputs:

 

I have consistently found the AC ripple levels on the DC rails to be more or less equal with a 110VAC or 230VAC mains supply. The results given below are for 230VAC only, but I will continue to check the levels at 110VAC during testing and publish them below if there are any significant differences.

 

AC ripple/noise on the +3V3 rail at 230VAC

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

AC ripple/noise on the +5V0 rail at 230VAC

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

AC ripple/noise on the +12V rail at 230VAC

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

AC ripple/noise on the -12V rail at 230VAC

Oscilloscope settings: Amplitude = 50mv/div, Timebase = 5uS/div

 

AC ripple/noise on the +5VSB rail at 230VAC

Oscilloscope settings: Amplitude = 20mv/div, Timebase = 5uS/div

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) AC Ripple/Noise
Supply = 230Vac/50Hz DC Loading = 1162W
DC Rail
+3V3
+5V0
+12V
-12V0
+5VSB
ATX12 Max (mV p-p)
50
50
120
120
50
Ripple (mV p-p)
150
150
90
200
60
Pass/Fail
Fail
Fail
Pass
Fail
Fail

 

The AC noise/ripple levels put out by the Cooler Master Silent Pro Gold 1200W are, to say the least, a little disappointing and fail to meet the requirements of the ATX12V V2.2 specification on all but the +12V rail. Will levels of this magnitude have any detrimental effects on PC stability? The answer is probably not because motherboards have AC noise/ripple suppression filtering built in and these levels will be far lower than any low end generic power supply, but it is nonetheless a failure for which the Cooler Master Silent Pro Gold 1200W must be marked down.

Testing:

Temperature, Noise Levels and Fan Speeds:

I am not going to give a pass or fail in this section, as the ATX12V V2.2 does not really have any references on which to base a decision.

Temperatures are purely for information only, as there are too many variables involved when installed in a case, which, by the way, it wasn't. Ambient temperature, processor cooling efficiency and case cooling fans all play their part on the temperature of the air entering the power supply, and consequently the temperature of the air leaving it. As such, no valid conclusions can be made from this test.

 

Cooler Master Silent Pro Gold 1200W (RS-C00-80GA-D3) Temperature & Fan Speeds
Supply = 110/230Vac
DC Loading(W)
Temp In (°C)
Temp Out (°C)
Δ Temp (°C)
Fan Speed (RPM)
0
N/A
N/A
N/A
760/768
242/242
23.3/23.4
32.0/32.9
8.7/9.5
769/774
590/597
23.7/23.4
36.6/35.6
12.9/12.2
793/800
1162/1162
25.4/25.3
37.1/36.8
11.7/11.5
2215/2202

The Cooler Master Silent Pro Gold 1200W power supply remained cool at all times with very low fan noise at low to medium DC loading. The full load fan speed of 2200RPM is a different story as it's far from silent, but I can't imagine many PC enthusiasts running the Cooler Master Silent Pro 1200W at full load for prolonged periods.

Conclusion:

 

Price Per the Watt:

Power Supply Cooler Master Silent Pro Gold 1200W at $269.99 = $0.23/Watt (07-2010)

 

The build quality of the Cooler Master Silent Pro Gold 1200W power supply is excellent - the finish is good and comes very well packaged with everything needed for a successful installation. The use of some innovative technologies have no doubt increased the efficiency of the unit, but I couldn't quite produce the results, following the OCC power supply testing methodology, to confirm its 80 Plus Gold status. This could in part be due to shortcomings in DC load and its use of fixed wire wound resistors, so it would be unfair to mark the power supply down in this respect, but all is still not well.

The Cooler Master Silent Pro Gold 1200W power supply produced a mixed bag of results during testing. The DC voltage load regulation was excellent and on a par with other power supplies in this class, but it did produce a disappointing set of results for AC noise/ripple. I always measure the AC noise/ripple levels at or near full DC load, which will always produce worst case results, but this is the recommended method as per the ATX12V V2.2 specification and the Cooler Master Silent Pro Gold 1200W doesn't perform too well.

The Cooler Master Silent Pro Gold 1200W is still worthy of your consideration - it certainly performs better than the majority of power supplies out there, but it's not quite up there with the likes of Corsair, Thermaltake, and PC Power and Cooling. Motherboards are fairly robust animals and will quite happily run for years with the poorest quality power supplies of which the Cooler Master Silent Pro Gold 1200W certainly isn't. If you are in need of a power supply for your next build/upgrade, or something to reliably power a couple of GTX 480s in SLI, then this power supply will certainly do the job.

 

Pros:

 

Cons: