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Seasonic X-Series 1250W Gold Power Supply Review

Manufacturer: Seasonic

Introduction and Features

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Seasonic has a well earned reputation for producing some of the best PC power supplies on the planet. Over the years, Seasonic has been the OEM (Original Equipment Manufacturer) of choice for companies like Corsair, PC Power & Cooling, and XFX to name just a few. But Seasonic also markets power supplies under their own brand name. The new X-Series 1050W and 1250W are Seasonic's newest and most powerfull PSUs to date. Both power supplies are based on Seasonic's X-Series line, which has brought several major advancements to the standard PC power supply platform since its introduction three years ago.

• Proprietary circuit design delivers High efficiency (80Plus Gold or Platinum certified)
• Full modular DC Connector Module features integrated VRMs (3.3V and 5V)
• Hybrid Silent Fan Control (3 modes of operation: Fanless, Silent and Cooling)
• High-quality Sanyo Denki SanAce120 dual ball bearing fan with PWM
• High-reliability 105°C grade A capacitors and solid polymer capacitors

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Here is what Seasonic has to say about their new X-Series Gold 1050W and 1250W power supplies:

"The X-1050 and X-1250 are the newest additions to one of our most successful retail lines currently available. Now the X-Series will extend from 400 and 460 watt fanless and then 560, 660, 760, 850 watt and now 1050 and 1250 watts for top end systems; a total of eight X-Series models in all.

80Plus Gold The X-1050W and X-1250W PSUs are certified in accordance to the 80PLUS organization's high standards, offering the newest technology and innovation for performance and energy savings with up to 90% efficiency and a true power factor of greater than 0.9 PF.

Full Modular Design (DC to DC) Common to all X-Series power supplies, the new X-150 and X-1250 feature the unique 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 Hybrid Silent Fan Control An industry first, advanced 3 phased (Fanless, Silent and Cooling Mode) thermal control balances between silence and cooling. In addition, a selector switch is provided to allow you to select between Seasonic S2FC control, without fanless mode or S3FC fan control with fanless mode.

Sanyo-Denki San Ace Silent Fan The world-renowned Sanyo Denki ball bearing fans are made of the highest quality components to insure maximum quality and performance. The use of spoon shaped high-density plastic fan blades with smoothed leading edges, strict tolerance ball bearings and precision copper axel are just some features to ensure ultra-low noise performance and quality."

Please continue reading our Seasonic X-1250 PSU review!

Seasonic X-Series 1050W and 1250W PSU Key Features:

• 1050/1250 watt continuous power output (up to 50°C)
• 80Plus Gold certified super high efficiency
• Seasonic DC Connector Module 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
• High +12V output (87A/104A)
• Tight voltage regulation (±3%)
• Supports high-end graphic cards with six/eight 6/8-pin PCI-E connectors
• Conductive polymer aluminum solid electrolytic capacitors
• High reliability 105°C Grade A capacitors
• Solid conductive polymer aluminum capacitors for enhanced stability
• Dual sided PCB layout
• Full modular cable design
• High current Gold plated terminals with Easy Swap connectors
• Active PFC (0.99 PF typical) with Universal AC input
• 5-Year warranty
• MSRP: $269.00 USD (€259.00 EU)

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
• DC Line Regulation
• DC Cross-load (unbalanced load)
• AC Ripple and Noise
• Power Factor
• Efficiency
• Differential Temperature
• Noise

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The Seasonic Platinum-1000 power supply was 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 (+12V1, +12V2, +12V3, and +12V4)
• (2) 200W Precision resistor load bank (+12V5 and +12V6)
• Switchable precision resistor load bank (-12V and +5VSB)
• Extech MultiMaster MM570 digital multimeter (Accuracy ±0.02%)
• 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)

March 7, 2013 | 11:20 PM - Posted by Glen (not verified)

Seasonic X-1250 1250W Power Supply

I've bought this PSU power supply for 1 year now and it has a 7 years warranty period. Sad thing is it has failed on me 4 times every 2 to 3 months later. Totally disappointed as i've to detach it again to have it exchange :(

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