SilverStone ST1200-PT Power Supply Review

The highest-end member of SilverStone's Strider Platinum line is the ST1200-PT, and we're ready to give it an exhaustive evaluation. It achieves a high power density score thanks to compact dimensions, and there's that 1200W capacity. But is this enough?

According to SilverStone its Strider Platinum line satisfies the requirements of professionals and enthusiasts. The family includes six members with capacities ranging from 550W to 1.2kW. Only the two top models are equipped with a 139mm Air Penetrator fan and FF141 magnetized fan filter. The other Strider Platinum units come with 120mm fans. They're smaller, so a 140mm fan wouldn't fit.
The ST1200-PT we're looking at today should have what it takes to drive a very potent system. In addition to high capacity, the PSU also includes two EPS and eight PCIe connectors to feed multiple graphics cards and a high-end motherboard.

For most enthusiasts, a 1200W power supply is overkill. But there are still folks building boxes with CrossFire and SLI configurations, plus aggressively overclocked CPUs. As we've mentioned before, these components may sip power conservatively in stock form, but higher frequencies and voltages have a big effect on consumption.
Moreover, many PSUs achieve the best efficiency under loads that fall within 40-50% of their maximum-rated capacity. You could argue that gaming systems won't always operate under full load, keeping them out of this sweet spot more often than not. But Platinum- and Titanium-class units are usually highly efficient under light loads as well. Even if your system sips power at idle, you won't suffer big energy losses with these high-capacity models.
We generally advise that you calculate your system's power needs under full load, and then buy a PSU with at least 20% more capacity. Further, favor more efficient units when your budget allows. Doing so allows you to save money on electricity and decrease your carbon footprint, since less energy goes wasted.

Specifications

SilverStone ST1200-PT

Manufacturer (OEM)

Enhance Electronics
Max. DC Output

1200W
Efficiency

80 PLUS Platinum
Modular

✓ (Fully)
Intel C6/C7 Power State Support

✓
Operating Temperature (Continuous Full Load)

0 - 40°C
Over Voltage

✓
Under Voltage Protection

✓
Over Power

✓
Over Current (+12V)

✗
Over Temperature

✓
Short Circuit

✓
No Load Operation

✓
Surge Protection

✓
Inrush Current

✓
Cooling

140mm Double-Ball Bearing Fan (HA1425H12B-Z)
Semi-Passive operation

✓ (non selectable)
Dimensions

150 x 86 x 180mm (W x H x D)
Weight

2.2kg (4.85lb)
Form Factor

ATX12V v2.4, EPS 2.92
Warranty

5 Years

The ST1200-PT is 80 PLUS Platinum-rated. Unfortunately, its maximum operating temperature for full-power delivery is rated at 40°C, which is typical of even high-end Enhance Electronics platforms. The available protection features include everything except OCP on the +12V rail (which is meaningless anyway in such a high-capacity PSU with one +12V rail). Given the low temperature rating, it is nice to see over-temperature protection. Enhance is one of the few OEMs that offers OTP in most of its designs.
Measuring 18cm deep, the ST1200-PT is pretty small for a 1.2kW power supply. SilverStone takes downsizing seriously; it recently announced an SFX-L-based unit with 800W max power!
SilverStone's five-year warranty is long enough, though it's worth mentioning that competing offerings are covered by warranties as long as 10 years.

Power Specifications

Rail		3.3V	5V	12V	5VSB	-12V
Max. Power	Amps	22	25	100	2.5	0.3
Max. Power	Watts	120		1200	12.5	3.6
Total Max. Power (W)		1200 (1250 Peak)

The single +12V rail is powerful, offering up to 100A output. The minor rails are quite strong as well, with 120W maximum combined power.
The only downside is the 5VSB rail, which is weak at up to 12.5W. Given the PSU's capacity, the 5VSB rail should have at least 3A max current output, with 4A being ideal.

Cables And Connectors

Modular Cables
Description	Cable Count	Connector Count (Total)	Gauge
ATX connector 20+4 pin (550mm)	1	1	16AWG
4+4 pin EPS12V (760mm)	1	1	16AWG
4+4 pin EPS12V (560mm)	1	1	16AWG
6+2 pin PCIe (560mm)	8	8	16AWG
SATA (610mm+150mm+150mm+150mm)	4	16	18AWG
Four-pin Molex (610mm+150mm+150mm) / FDD (+150mm)	2	6 / 2	18AWG

The main ATX cable could be a little longer, reaching 60cm, since a 1.2kW PSU is probably destined for a full-tower chassis. SilverStone equips this PSU with two EPS cables, one of which is 20cm shorter than the other. The number of PCIe cables is adequate, and one of the ST1200-PT unit's advantages is that each PCIe cable only hosts a single connector. This might cause some trouble during the installation and cable management process, but it should also facilitate tighter load regulation.
The number of SATA and four-pin Molex connectors is pretty large, and the distance between connectors is ample at 15cm. Finally, the main ATX, EPS, and PCIe cables use 16-gauge wires for lower voltage drops under higher loads.

Power Distribution

Since this PSU features a single +12V rail, we do not have anything to say about its power distribution.

by GadTech-ID

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Tags: Power Supply / Review