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Seasonic Platinum Series 1050W & 1200W Power Supply Review

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Manufacturer: Seasonic

Introduction and Features

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Today we have a double header for your reading enjoyment. Not one, but two Platinum Series power supplies from Seasonic. The two latest additions to Seasonic’s flagship product line are the Platinum 1050W and Platinum 1200W PSUs. The power supplies feature tight voltage regulation (±1~2%), quiet operation (fanless mode), and high efficiency (80Plus Platinum certified). Both PSUs are fully modular and come backed by a 7-year warranty.

Seasonic is a well known and highly respected OEM that produces some of the best PC power supplies on the market today. In addition to supplying power supplies to many big-name companies who re-brand the units with their own name, Seasonic also sells a full line of power supplies under the Seasonic name. Both new power supplies feature an improved Hybrid Fan control circuit and upgraded copper conduction bars on the main PCB, which together help increase efficiency and performance.

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Seasonic Platinum 1050W & 1200W Special Features

Ultra Tight Voltage Regulation Improved load voltage regulation keeps the voltage fluctuations on the 12V output within +2% and -0% (no negative tolerance), and on the 3.3V and 5V outputs between +1% and -1%, which (under 80 Plus load conditions) results in smooth and stable operation.

Seasonic Hybrid Silent Fan Control The industry first, advanced three-phased thermal control balances between silence and cooling. The Hybrid Silent Fan Control provides three operational stages: Fanless, Silent and Cooling Mode.  In addition, a selector switch is provided to allow for manual selection between the Seasonic S2FC (fan control without Fanless Mode) or S3FC (fan control including Fanless Mode).

Reduced Cooling Fan Hysteresis is achieved by a new fan control IC, which optimizes how frequently the fan switches on and off. At 25°C ambient temperature the fan turns on when the load rises above 30% (±5%) and turns off when the load drops below 20% % (±5%). Due to this lag in response the fan switches on and off less frequently, which reduces power loss in Fanless and Silent Mode.

Dual Copper Conduction Bars on the power supply PCB help reduce impedance and minimize voltage drop, which further improves efficiency and performance.

80Plus Platinum The Platinum 1050W & 1200W power supplies are certified in accordance to the 80PLUS organization's Platinum standards, offering performance and energy savings with up to ≥92% efficiency and a true power factor of greater than 0.9 PF.

Full Modular Design (DC to DC) The Seasonic Platinum Series power supplies feature an integrated DC connector panel with onboard VRM (Voltage Regulator Module) that enables not only near perfect DC-to-DC conversion with reduction of current loss/impedance and increase of efficiency but also a fully modular DC cabling that enables maximum flexibility of integration and forward compatibility.

Seasonic Platinum Series 1050W & 1200W PSU Key Features:

•    80Plus Platinum certified super high efficiency
•    Ultra tight voltage regulation
•    Fully Modular Cable design with flat ribbon-style cables
•    Seasonic DC Connector Panel with integrated VRMs
•    DC to DC Converter design
•    Hybrid Silent Fan Control (3 modes of operation: Fanless, Silent and Cooling)
•    High-quality Sanyo Denki San Ace dual ball bearing fan with PWM
•    Ultra-tight voltage regulation (+2% and -0% +12V rail)
•    Dual copper conduction bars on PCB for improved efficiency and performance
•    Supports multi-GPU technologies
•    Conductive polymer aluminum solid capacitors
•    High reliability 105°C Japanese made electrolytic capacitors
•    ErP Lot 6 2013 compliant and Intel Haswell processor ready
•    High current Gold plated terminals with Easy Swap connectors
•    Active PFC (0.99 PF typical) with Universal AC input
•    7-Year manufacturer's warranty worldwide

Please continue reading our Seasonic Platinum 1050W & 1200W power supply review!

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Here is what Seasonic has to say about their new 1050W and 1200W Platinum Series power supplies: “We at Seasonic put great emphasis on progressive research to stay in the forefront of innovation and we are continuously looking to integrate new technologies into our products. The new Platinum 1050 and Platinum 1200 does not only boast with unparalleled Ultra Tight Voltage control, but it also has a new fan control IC built in, which optimizes the operation of the fan by (decreasing) hysteresis. As a result of this new feature the cooling fan will turn on and off less frequently and there will also be a reduction in energy loss in Fanless and Silent mode. To further reduce impedance and to minimize voltage drops we have equipped the Platinum 1050 and Platinum 1200 power supplies with pure copper conduction bars on the main PCB that conduct high current more efficiently.

PSU Testing Methodology

Establishing an accurate load is critical to testing and evaluating a PC power supply.  PCPerspective’s power supply test bench can place a precise DC load on the PSU under test.  Each power supply is tested under controlled, real-world conditions up to its maximum rated load (at 40ºC), using both 115 VAC and 240 VAC line voltage.  Our current suite of tests includes:

•    DC Load Regulation
•    AC Ripple and Noise
•    Efficiency
•    Differential Temperature
•    Noise

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The Seasonic Platinum 1050W and Platinum 1200W power supplies were evaluated on both features and performance.  A full range of equipment was used to test the power supply under controlled load conditions.  

•    (2) CSI3710A Programmable DC load (+3.3V and +5V outputs)
•    (4) CSI3711A Programmable DC load (+12V)
•    (3) 218W Precision resistor load bank (+12V)
•    Switchable precision resistor load bank (-12V and +5VSB)
•    Agilent 34401A digital multimeter (Accuracy ±0.0035% vDC)
•    Extech 380803 Power Analyzer (Accuracy ±0.5% of full scale)
•    DS1M12 "StingRay" digital oscilloscope (20M S/s with 12 Bit ADC)
•    Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC
•    Extech Model 407738 digital sound level meter (Accuracy ±1.5 dB)

The following cables/connectors were used to connect each PSU to the PCPerspective power supply test equipment.
•    (1) 20+4 pin ATX
•    (1) 4+4 pin EPS/ATX12V
•    (1) 8 pin EPS12V
•    (8) 6-pin PCI-E
•    (2) SATA
•    (2) Molex


September 30, 2014 | 09:41 AM - Posted by BBMan (not verified)

While I may never buy a drive this size, I have yet to lose a Seasonic PSU. I just retired a 2006 rig and the PSU was part of the original build- it's now a spare. The replacement rig has a lighter version of this PSU, but I like how Seasonic is rolling too.

/end plug

September 30, 2014 | 05:26 PM - Posted by Lance Ripplinger (not verified)

Why does Seasonic continue to put the text labeling on their power supply units upside down? They are the only ones that I have come across who do that, and it doesn't make any sense, and makes trying to read the labels when hooking up the cables an pain in the arse.

September 30, 2014 | 07:20 PM - Posted by Dr_b_

Efficiency. See graphs which spell it "Efficeincy"

October 1, 2014 | 05:34 AM - Posted by Anonymous (not verified)

Isn't pretty much every PSU a seasonic anyways?

October 1, 2014 | 10:12 AM - Posted by BBMan (not verified)

Now that's funny.

October 22, 2014 | 12:01 PM - Posted by Anonymous (not verified)

I got two of this PSU's both making very annoying high pitch whistling sound.
Seasonic RMA has not fix my issue.
I had the older brother 1000W platinum and was very quiet, this one is nightmare.
I'm done with Seasonic for now.

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