Platinum 1200

This power supply is the proud owner of The Best Power Supply Award of the year 2014 and it truly is the pinnacle of top notch engineering. High-end systems builders looking for an efficient and reliable power solution will be excited about the great functions this unit offers. The full modularity makes system building not only customizable but it will result in a clutter-free, well-ventilated computer case. The extremely efficient, high-reliability components coupled with ultra-tight voltage regulation ensure that there is plenty of headroom for the startup of overclocked systems. This power supply is the best for the best!

SKU: SS-1200XP3 Active PFC Categories: ,

80 PLUS®Platinum

The higher the level of efficiency of the power supply, the less power gets wasted in the form of excess heat . The 80 PLUS® Platinum certification guarantees greater than 90 %, 92 % and 89 % efficiency at 20 %, 50 % and 100 % operating loads, respectively. The Seasonic Platinum Series represents the highest level of technology and efficiency achievement of Sea Sonic during its 40 years of commitment to engineering excellence.

The New Seasonic S3FC Fan control

XP3 XM2 fan chart


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

New! Power saving by hysteresis

Hysteresis is achieved by an additional 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 35 % (±5 %) and it turns off when the load drops below 25 % (±5 %). Due to this lag in response the fan switches on and off less frequently, which reduces noise and power loss in Fanless Mode and Silent Mode.

Dual Copper Bars-01  

Dual Copper Bars

Due to their increased diameter, pure copper bars carry high current much more effectively than the traditional copper strips. If the goal is to achieve high quality power conversion with stable power output and minimized loss, it is very important that power conduction in the high wattage area remains extremely efficient, because it also reduces impedance and minimizes voltage drop as the load increases.

Ultra Stable Voltage-01

No Negative Voltage Tolerance

Intel guidelines specify that the DC output voltages have to remain within the regulation range of +/- 5 %. However, power supply testers and reviewers prefer to have this allowance down to +/- 3 %. Seasonic has implemented and even stricter voltage regulation which entirely eliminates negative deviations and keeps voltage 80% tighter than Intel specifications and 66 % tighter than top reviewers recommend. The result of clean output power is quicker CPU response and a better overclocking performance.

Fan Type Sanyo Denki-01

Sanyo Denki Fan

The world-renowned Sanyo Denki ball bearing fans are made of the highest quality components to ensure ultra-low noise performance. The fan’s perfect balance and even rotations are achieved via the use of spoon-shaped, high-density plastic fan blades that are finished off with smoothed leading edges. Sanyo Denki fans are known for their strict tolerance ball bearings and precision copper axels. Instead of the industry standard of two balancing points they use three points to strengthen the mount and further stabilize the blade.

7 Years Warranty-01

7 Years Warranty

Our commitment to superior Seasonic quality.

Specifications are subject to change without prior notice.
Note: Since the beginning of 2015, Seasonic has implemented changes in its retail box design and modular cables are now packed in a black cardboard box.

Platinum 1200
AC InputVoltage: 100 V - 240 V
Current: 15 A
Frequency: 50 Hz - 60 Hz
DC OutputRail+3.3 V+5 V+12 V-12 V+5 VSB
Maximum Power25 A25 A100 A0.5 A3 A
125 W1200 W6 W15 W
Total continuous power1200 W
Platinum 1200 Technical Specifications
Form FactorIntel ATX 12 V
Dimensions150 mm (W) x 190 mm (L) x 86 mm (H)
Fan InformationFan Size120 mm
Fan ControlNew Seasonic S3FC
Fan BearingDouble Ball Bearing
Life Expectancy70,000 at 40 °C, 15 % - 65 % R.H.
Cable InformationModularityFully Modular
Cable typeFlat black cables
Electrical FeaturesOperating Temperature40 °C
MTBF @ 25 °C, excl. fan150,000 hours
AC InputFull Range
ProtectionOPP, OVP, UVP, OCP, OTP, SCP
Safety and EnvironmentalSafety and EMCcTUVus, TUV, CB , BSMI, CCC, CE, FCC, C-tick
Environmental ComplianceEnergy Star, RoHS, WEEE, ErP Lot 6, REACH
Warranty7 Years
Packaging information
Units per carton4
Individual carton size385 (L) x 130 (W) x 195 (H) mm
Shipping carton size545 (L) x 215 (W) x 405 (H) mm

Specifications are subject to change without prior notice.

ConnectorConnector CountLengths
MAIN-POWER-24-20-PIN-A1610 mm - modular
PCIE-8-PIN-A2650 mm - 8/4 pins modular
650 mm - 8 pins modular
PCIE-6-8-PIN-1-A10550 + 100mm - modular
550 + 100mm - modular
550 + 100mm - modular
550 + 100mm - modular
550 + 100mm - modular
SATA-5-PIN-A14400 + 120 + 120 + 120 mm - modular
400 + 120 + 120 + 120 mm - modular
400 + 120 + 120 + 120 mm - modular
400 + 120 + 120 + 120 mm - modular
300 + 120 mm - modular
PERIPHERAL-4-PIN-A5400 + 120 + 120 mm - modular
300 + 120 mm - modular
FDD-4-PIN-1-A1101 mm - modular
Specifications are subject to change without prior notice.


KitGuru | Best PSU of 2014

January 5, 2014

“For enthusiasts, the power supply is Avatar’s Tree of Souls – Vitraya Ramunong – that connects everything together and provides the life force needed for the magic to work.”

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PC Perspective | Gold Award

September 30, 2014

“Seasonic continues to hone their comprehensive product line with the introduction of two new Platinum Series power supplies. The enhancements made to the Platinum 1050 and Platinum 1200 translate to excellent performance, high efficiency and the ability to operate in silent-fanless mode at lower power levels. Throw in a 7-year warranty, a great assortment of all modular cables, really tight voltage regulation, clean DC outputs and you have two very good power supplies to consider for your next build or upgrade.”

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Tecnic3D | Gold Award / ECO Award

July 28, 2014

“Das Seasonic Platinum P-1200 Netzteil mit der Modellbezeichnung SS-1200XP³ bietet eine ausgezeichnete Ausstattung, ein effektives Kühlmanagement und Anschlüsse im Überfluss. Das sich dies und andere Features, wie beispielsweise das vollmodulare Kabelmanagement, auf den Preis auswirken ist wohl unvermeidlich.”

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TechPowerUP | Editor’s Choice

July 28, 2014

“Seasonic’s name shines even brighter with such products as the one I tested today. Their new XP3 platform is awesome, and teaches manufacturers a lesson in how to push analog circuits to their limits for some incredible voltage regulation (stability of rails). With very high efficiency throughout its entire load range and very clean rails, overall performance was superb.”

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HardOCP | Silver Award

July 1, 2014

“The bottom line however is that the Platinum-1200 did better than the other 1200 watt 80 Plus Platinum units we have seen to date overall and it costs less than those units (Corsair AX1200i and Enermax Platimax 1200W) so that does make it somewhat of the “bargain” 1200W 80 Plus Platinum unit.”

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Hardware MX | Editor’s Choice and Recommended Product

June 25, 2014

“…los mejores componentes electrónicos”

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Tweak.dk | Safe buy and Score 9

June 19, 2014

“…Seasonic Platinum 1200 er en lækker PSU med masser af power, fede features og et lækkert design…”

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Gamezoom | Platin Award (Perfect 10)

June 13, 2014

“Auch puncto Sicherheit (Schutzschaltungen) spielt das Seasonic Netzteil in der ersten Liga mit – was -natürlich- auch die hochwertigen Bauteile betrifft.”

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Next Hardware | 5 star and Best Buy

June 12, 2014

“…assegniamo senza alcuna incertezza al Seasonic Platinum 1200 il nostro massimo riconoscimento ed il titolo di Best Buy.”

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Hispazone | Editor’s Choice

May 29, 2014

“Seasonic es nuestra marca de referencia….”
“…una fuente que sobresale entre las sobresalientes.”

(Read More)

Kitguru | Must Have

May 23, 2014

“The Seasonic Platinum 1200W Modular Power Supply is an extremely impressive flagship model that will target the discerning audience who are powering expensive Crossfire and SLi systems with two or more graphics cards.”

(Read More)






Platinum 1200
Platinum 1200
Platinum 1200
Platinum 1200
Platinum 1200