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Corsair AX1200i Digital ATX 1200W Power Supply Review

Author: Lee Garbutt
Manufacturer: Corsair

A Detailed Look

The Corsair AX1200i Digital power supply supports the latest ATX12V v2.31 and EPS12V 2.92 standards and is backward compatible with ATX12V 2.2 and ATX12V 2.01.  The AX1200i is rated for a combined, continuous output power of up to 1,204 watts at 50°C operating temperature.  That’s important as some less reputable manufactures limit their power supply’s advertised capacity by specifying a lower operating temperature (25°C) in the fine print. 

The AX1200i Digital PSU incorporates a single +12V output (user-configurable virtual “single” or “multi-rail” software modes) that can deliver up to 100.4A, which is the full capacity of the unit.  The PSU includes universal AC line input (automatically adjusts the AC line voltage) and active PFC, which makes the unit more environmentally friendly to the local power grid. 

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AX1200i Digital PSU Specifications (courtesy of Corsair)

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The Corsair AX1200i Digital power supply enclosure is painted matte black and is 200mm (7.9”) deep.  It uses a single 140mm fan on the bottom for cooling, which is the same high-quality fan Corsair used in the original AX1200.  The fan speed is automatically controlled by the internal component temperature (optionally configured through the Corsair Link software) but doesn’t turn on and start spinning until the PSU reaches ~30% load.  Up until that point the AX1200i is silent. The dual ball bearing Yate Loon Electronics fan (D14BH-12) is a relatively powerful high-speed fan that has the potential to provide excellent airflow and cooling.

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The back panel includes a heavy duty On-Off switch and AC receptacle along with an open honeycomb grill that allows the exhaust air to exit the power supply with minimal resistance and turbulence.

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August 30, 2012 | 11:59 AM - Posted by KngtRider

Lee and or PCPER I am a bit confused about the PSU test bench as described in this article. 'Up to 2000W' but also mention real-world test.

Which tests are you using the PC-based load for and which tests are you using simulated loads for ?

Or are you using both?

Many of the top review sites are using the imported ATX tester or home brew resistor grids which is not a 'real world test' (but a simulated one) and I am interested as to how you are pulling off a real world PSU test

Additionally, testing in open air versus mounted in a warm PC chassis, typically pushed against a wall or under a desk.


August 30, 2012 | 08:21 PM - Posted by Lee Garbutt

The PCPerspective PSU test bench uses a combination of six Progammable DC loads and up to three different banks of precision load resistors to create the various loads (up to 2,000W max). The real-world testing is stated because we mount each PSU in a modified case and recirculate some of the warm exhaust air back to the inlet to "simulate" real-world operating conditions.  The loads are not real-world (actually much more precise and programmable) but the test environment is, temps gradually increase as the load increases just like in a real PC - the best of both worlds.

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