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Seasonic X Series 750W Power Supply Review

Manufacturer: Seasonic
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Introduction and Features

Introduction

                   

Seasonic has an earned an excellent reputation for producing quiet PC power supplies with high efficiencies and stable outputs.  They are also one of the leading power supply manufacturers that continually push the design envelope and the new X Series is the result of their latest efforts.  Seasonic's X Series brings several major advancements to the standard ATX PC PSU platform.  They will initially be offered in two models (650W and 750W) with more expected to follow.

•    Full modular DC connector module features integrated VRMs (3.3V and 5V)

•    Hybrid Silent Fan Control2 (3 modes of operation: Fanless, Silent and Cooling)

•    New proprietary circuit design delivers High efficiency (80Plus Gold certified)

•    High-quality Sanyo Denki San Ace dual ball bearing fan with PWM

•    Green Innovation (long life cycle, high quality components, high efficiency, and value)

Seasonic X Series 750W Power Supply

Here is what Seasonic has to say about their new X Series power supplies: "The very first full modular multi-output ATX, high-wattage power supply that has ever obtained the 80PLUS® Gold certification is now available in the market. Introduced by Seasonic, this coveted power supply is named “X” and is initially offered in 650 and 750 watt versions to fulfill computer enthusiasts’ need for an ultimate power source. Packed with revolutionary patent pending designs such as DC to DC Converter and fanless operation mode, Seasonic’s X Series features an advanced interior layout that represents a great leap forward in the evolution of PC power supply. Featuring a patent pending design of “DC Connector Module with Integrated VRM”, the X Series is set to achieve both near-perfect DC to DC conversion and fully modularized design without compromising efficiency. After a long wait, finally there is a product that delivers the complete package, ultra-high efficiency, greatly improved dynamic response, and customizable cable arrangement that is tailored to meet any individual’s needs.



As a leading provider of silent power supply, Seasonic this time around delivers a true breakthrough solution for thermal and noise management. The X Series adopts a clever “Hybrid Silent Fan Control” design, which offers three distinct operation modes, fanless mode, silent mode, and cooling mode. The X automatically adjusts fan mode and speed according to the ambient temperature level. This brand new design not only optimizes heat dissipation, but also prolongs lifespan of the system by reducing unnecessary fan rotation. To make the X Series even more robust and exciting, Seasonic offers Sanyo Denki San Ace PWM Silent Fan on X, the best fan there is in the industry and taking advantage of the PWM feature.



Seasonic’s attention to detail does not stop at a single component. The X Series is equipped with solid capacitors and Japanese brand 105oC capacitor for better reliability and longer product life.  Seasonic X Series features a unique fully modular design that offers integration and flexibility. The X series comes with 2 sets of 8-pin connectors for high end servers. For added convenience, 4 sets of 8/6P PCI-E connector and HDD, SATA&FDD connectors are also included to support the latest graphic cards and other application extensions.  The X Series is a crowning achievement that comes from 34 years of dedication to research and development with one goal in mind, constant pursuit of a greener and better environment. The X Series is on its way to become the ultimate power supply that completely redefines the user experience."

Seasonic X Series PSU Key Features:

•    750 watt continuous power output (up to 50°C)

•    80Plus Gold certified super high efficiency

•    Full modular DC connector module features integrated VRMs (3.3V and 5V)

•    Hybrid Silent Fan Control2 (3 modes of operation: Fanless, Silent and Cooling)

•    High-quality Sanyo Denki San Ace dual ball bearing fan with PWM

•    New proprietary circuit design delivers High efficiency (80Plus Gold certified)

•    High +12V output (62A/744W)

•    Tight voltage regulation (±3%)

•    Green Innovations (long life cycle, high quality components, high efficiency, and value)

•    Supports high-end graphic cards with two 6/8-pin PCI-E connectors

•    High-quality Japanese capacitors for maximum durability (105°C)

•    Solid conductive polymer aluminum capacitors for enhanced stability

•    Dual sided PCB layout

•    Active PFC with Universal AC input

•    5-Year warranty

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 2,000 watt DC load on the PSU under test.  Each power supply is tested under controlled, real-world conditions up to its maximum rated load, 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


The Seasonic X Series 750W 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)

•    Extech MultiMaster MM570 digital multimeter (Accuracy ±0.02%)

•    Extech 380803 Power Analyzer (Accuracy ±0.5% of full scale)

•    Hitachi V-650F 60 MHz dual trace oscilloscope (Accuracy ±3%)

•    Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC

•    Extech Model 407738 digital sound level meter (Accuracy ±1.5 dB)

•    Custom PC60 enclosure to simulate real-world operating conditions


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