Corsair AX750

With sales of around 150,000 PSUs a month, Corsair is one of the largest vendors for retail power supplies. Corsair got in earlier than most other lateral entrants like GeIL or A-DATA, and their time in the market has enabled them to gather a lot of experience even if they don't have their own factory. In recent times they've used CWT, Seasonic and Flextronics as their PSU ODMs.

A few weeks ago Corsair presented their newest PSUs, the AX series. The goal is to provide performance, quality and high efficiency, this is apparently the best power supply Corsair can offer at the moment. Today we'll look at the AX750; is the 80Plus Gold certificate justified? And what other useful features does it provide?

The AX750 and 850W models are based on a Seasonic design (X-400FL and/or X-760) with some modifications in the details. For example Corsair uses flat peripheral cables and offers a 7-year warranty. They don't have the PWM fan from the original (it's an Antec patent), but they use the same kind of fan regulation; we will see that later in our test. Interesting features include the fully modular cable management and a silent, semi-passive fan control. Here's a complete rundown of the features (and marketing material).

Corsair Professional Series Gold AX750 features:

  • Supports the latest ATX12V v2.31 and EPS 2.92 standards and is backward compatible with ATX12V 2.2 and ATX12V 2.01 systems
  • An ultra-quiet 120mm double ball-bearing fan delivers excellent airflow at an exceptionally low noise level by varying fan speed in response to temperature
  • 80 Plus Gold certified to deliver at least 90% efficiency at 50% load
  • Active Power Factor Correction (PFC) with PF value of 0.99
  • Universal AC input from 90~264V
    • No more hassle of flipping that tiny red switch to select the voltage input!
  • A dedicated single +12V rail offers maximum compatibility with the latest components
  • Over-voltage and over-current 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
  • 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 maximize airflow through your computer's chassis
  • A seven year warranty and lifetime access to Corsair's legendary technical support and customer service
  • Dimensions: 150mm(W) x 86mm(H) x 160mm(L)
  • MTBF: 100,000 hours
  • Safety Approvals: UL, CUL, CE, CB, FCC Class B, TÜV, CCC, C-tick

The 750W version is currently on sale for $150 online, with an additional $20 mail-in rebate. That's not too shabby, considering the older Seasonic X-750 still costs $170. However, we'll need to see if the quality of the AX750 matches the X-750 before we can determine if the reduced price makes this a better buy.

Package Contents and Power Rating
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  • Chapbass - Tuesday, November 30, 2010 - link

    On the cables and connectors page: last para:

    The only potential issue is if you want to load up all we SATA connectors with a bottom-mounted PUS; the distance from the PSU to the first connector is only 45cm (give or take), with a fairly large 12-13cm gap between the connectors, so you'd want the HDD bays to be relatively close to the PSU rather than in the top portion of the case.

    First sentence has a few typos. Still reading, but figured I'd point it out.
  • Shadowmaster625 - Tuesday, November 30, 2010 - link

    Aren't all PUS's bottom mounted?
  • Stuka87 - Tuesday, November 30, 2010 - link

    Many newer cases do use a bottom mounted CPU, but it is hardly the only form factor.
  • Stuka87 - Tuesday, November 30, 2010 - link

    CPU should be PSU. Wish there was an edit :/
  • Iketh - Wednesday, December 1, 2010 - link

    pretty sure they're rear-mounted when bent over
  • Nintendesert - Tuesday, November 30, 2010 - link

    Last page, first paragraph.

    "Gold requirements. 91% at 50% load is not to shabby."

    It should be "too shabby."
  • Chapbass - Tuesday, November 30, 2010 - link

    Gotta say this PSU looks impressive. I'm going to need something soon for my server (not much in the way of cpu and video power, but along the lines of 18-20 HDD's), and something like this might fit the bill. we'll have to see :)

    props to corsair, another solid unit.
  • prince34 - Tuesday, November 30, 2010 - link

    I've been looking for a new high quality PSU for a new build early next year. This looks very promising. Also, Newegg has a $20 mail in rebate and $15 promotional code with free shipping. Thats $135 up front and $115 in the end. That is hard to beat.
  • mino - Tuesday, November 30, 2010 - link

    This left me puzzled though:

    "The AX has DC-to-DC for the smaller rails, so +12V feeds +3.3V/+5V and you can't use the whole 62A there."

    I know of exactly ZERO XXX-watt power supplies where you can load 3.3V or 5V _in_addition_to_ the XXX watts being consumed on 12V rails.

    Actually, most PSU's on the market do not allow anywhere near 99% of its rated load purely via 12V rails like this one. So if anything, such an arrangement should considered a plus.
  • Beenthere - Tuesday, November 30, 2010 - link

    These days there are lots of PSUs to chose from and the devil seems to be in the details. History has shown that Seasonic can produce good PSUs under their own brand and for other companies but that not all PSUs from them are not equal in design or performance.

    Without knowing exactly what the hardware differences are between PSUs and how this impacts performance or reliability makes it challenging when purchasing a new PSU. I watch hardware sites for patterns of issues with specific PSU models and brands when I'm looking for a new PSU.

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