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Corsair AX1200 1200W Power Supply Review




Review Sample: Corsair AX1200 1200W Power Supply, Part Number CMPSU-1200AX.















Ratings Table:

Corsair AX1200 1200W (CMPSU-1200AX) Power Supply Specification Table
AC Input
90-264V     15A     50-60Hz
DC Output
Maximum Load
Maximum Combined


System Protection:

No specific figures are available, so the following sentence is taken from the user manual.

Over-current and over-voltage protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components.


Safety & Agency Approvals:

The safety and agency approvals are quite often listed somewhere in the user manual but not this time - the following agency approval icons are printed on the packaging and/or power supply specification label.

UL, TUV, CE, C Tick, CCC, FCC & RoHS.


Power Supply Physical Characteristics:

Corsair AX1200 1200W (CMPSU-1200AX) Power Supply Physical Characteristics


Power Supply Connectors:

Corsair AX1200 1200W (CMPSU-1200AX) Power Supply Connectors
Connector Type
Motherboard 20+4 Pin
ATX12V/EPS12V 4+4 Pin
PCI-E 6+2 Pin
SATA Power 15 Pin
Peripheral 4 Pin
FDD 4 Pin


Power Supply Cable Lengths:

Corsair AX1200 1200W (CMPSU-1200AX) Power Supply Cable Set
Cable Type
Cable Length/Connector Spacings
PSU > 24" > Motherboard 20+4 Pin
PSU > 24" > ATX12V/EPS12V 4+4 Pin
PSU > 24" > PCI-E 6+2 Pin
PSU > 18" > SATA > 4" > SATA > 4" > SATA > 4" > SATA
PSU > 16" > SATA > 4" > SATA
PSU > 18" > Peripheral > 4" > Peripheral > 4" > Peripheral > 4" > Peripheral
Peripheral > 4" > FDD


Key Features:

All the following information is taken from the user manual, box packaging and reviewers guide. Lots of information provided, most of which I feel duty bound to pass on!

The Corsair Professional Series Gold AX1200 PSU has been designed from the ground up by Corsair to be the highest performing and most technologically advanced 1200W power supply on the market.

Built using server grade power train architecture, designed for mission critical levels of reliability, the Professional Series AX1200 delivers previously unheard of levels of performance for demanding enthusiasts and gamers.

Combined with exceptionally high energy efficiency, achieving 80 Plus gold certification, a fully modular cable system, and an advanced PCB and cooling design, the AX1200 is also one of the most efficient and quietest power supplies available.


Overview of Key Features:

Unique Design, Exclusive to Corsair

The AX1200 has been designed from the ground up by Corsair's power engineering team, and is therefore unique and exclusive to Corsair. It has been designed for one purpose - to be the world's best ATX 1200W power supply.

100.4 Amp Single +12V Rail

The AX1200's massive 100.4 Amp (1204.8W) Single 12V rail makes it the ideal power supply for ultra-high end SLI and Crossfire gaming PCs based around multi-core CPUs.

80 Plus GOLD Efficiency

The sophisticated electrical design, incorporating advanced magnetic modelling during development in order to optimize magnetic component performance, delivers exceptionally high energy efficiency (90% and above). This meets or exceeds the requirements for 80 Plus gold certification.

Server Grade Architecture for Outstanding Noise/Ripple and DC Voltage Regulation

The AX1200 features technology previously unheard of in a consumer power supply. Such features include individual DC-DC regulation for 3V3, 5V and 12V rails, and secondary side synchronous rectification, utilizing MOSFETs that have lower losses than the conventional output rectification schemes that utilize Schottky diodes. Plus, the advanced 4 layer modular connector board PCB ensures a better ground return plane, lower resistance and low voltage drops. This, combined with circuit trace optimization, also helps to minimize ripple and noise.

Fully Modular Cable System

The fully modular, low profile cable system provides maximum flexibility when building or upgrading your PC, and maximum airflow through your chassis. This allows you to use only those cables that you need, reducing cable clutter and maximising the cooling performance of your PC.


Corsair AX1200 Summary of Advantages:

  • Unique design, exclusive to Corsair
  • 100.4 Amp Single +12V rail
  • 80 Plus Gold Efficiency
  • Server grade Power Train Architecture
  • ZVS/ZCS technology
  • Independent DC-DC Convertors
  • Ultra Low Noise design
  • Premium quality components
  • Fully modular cable system
  • Seven year warranty


Extended Feature List:

  • Supports ATX12V V2.31 and EPS 2.92 standards and is backwards compatible with ATX12V V2.2 and ATX12V V2.01.
  • Ultra quiet 140mm fan delivers excellent airflow at low noise levels by varying fan speed in response to temperature.
  • Up to 90% energy efficiency at real world load conditions means less heat generation and lower energy bills.
  • 0.99 Active Power Factor Correction provides clean and reliable power.
  • Universal AC input from 90 to 264V. No more hassle from flipping that tiny red switch to select the voltage input!
  • A dedicated single +12V rail offers maximum compatibility with the latest components.
  • Over-current and over-voltage protection, under-voltage protection, and short circuit protection provide maximum safety to your critical system components.
  • High quality Japanese capacitors provide uncompromised performance and reliability.
  • The completely modular cable system allows you to use only the cables you need. Power supply upgrade and replacement is easy, as the cables only need to be disconnected at the power supply.
  • Low profile, flat cable design reduces air friction and helps maximise airflow through your computer's chassis.
  • A seven year warranty and lifetime access to Corsairs legendary technical support and customer service.

The performance had better be good after all that!

  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation At 110VAC & 230VAC
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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