Review Index:

Corsair TX850 850W Power Supply Review

Manufacturer: Corsair Components

Introduction and Features


Corsair Micro continues to expand their PC power supply offering with the addition of an 850W model to the popular TX series.  With a combined focus on pricing and performance, Corsair’s TX series is designed to deliver stable voltages, high efficiency and quiet operation for value conscious users who are looking for a PSU in the 650W, 750W or 850W range. 

(Courtesy Corsair Micro)

All three Corsair TX series power supplies feature a single, powerful +12V rail, energy efficient circuitry, and a large 140mm (120mm on TX650W) diameter, temperature controlled fan for quiet operation.  The TX850W power supply supports multiple high-end graphic cards and comes with four 6/8-pin PCI-E connectors.  And Corsair continues to back all of their power supplies with a 5-year warranty!

Corsair CMPSU-850TX PSU Key Features:

•    850 watts continuous power output (up to 50°C)

•    Supports the latest ATX12V v2.2 standard and EPS12V 2.91 standards

•    Dedicated single +12V output (up to 70A/840W)

•    High quality 140mm variable speed fan

•    80%+ Energy efficiency (at 20%, 50% and 100% loads)

•    Active PFC with Universal AC line input

•    High quality Japanese capacitors for uncompromised performance and reliability

•    Compact chassis size: 5.9” (W) x 3.4” (H) x 6.3” (L); 150mm x 86mm x 160mm

•    Over current/Voltage/Power Protection, Under Voltage Protection, and Short Circuit Protection

•    MTBF: 100,000 Hours

•    5-Year warranty and legendary Corsair customer service

The Corsair TX850W power supply arrived securely packed inside a colorfully printed black and yellow box showcasing the unit’s features and specifications.  The power supply is protected by thick foam inserts and wrapped in a fancy black felt bag with the Corsair logo.

In addition to the power supply the box also contains a power cord, mounting screws, wire ties, Corsair case badge, and a printed User’s Manual.

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 (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

The Corsair TX850W 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 ouputs)

•    (4) CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)

•    FLUKE 87-III True RMS digital multimeter (Accuracy ±0.05%)

•    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

•    FLUKE  52-II digital thermometer (Accuracy ±0.3ºC/0.5ºF)

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

•    Custom Lian Li PC60 enclosure to simulate real-world operating conditions

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