Just a warning for others considering purchasing the AX1200i. This issue almost certainly applies to the AX860i and AX760i too since they use the same software (Corsair Link). The monitoring and control software is pretty much useless.
The PCIe rails get stuck, and give wildly ridiculous current indications that have no relationship to reality.
I RMA'd my first AX1200i because of it, here's the thread: http://forum.corsair.com/v3/showthread.php?t=111282
Then it seemed OK for a few days, until I noticed the replacement was doing it again: http://forum.corsair.com/v3/showthread.php?p=608540
Then I asked in http://forum.corsair.com/v3/showthread.php?p=612174
if Corsair could reproduce the issue I was seeing.
A Corsair employee told me:
Originally Posted by RAM GUY
We have not seen this issue in our testing so no we have not duplicated the issue. I am waiting for more feed back from Engineering at this point.
And so far you are the only user reporting this issue so beyond that I would suggest using a different PSU to test the system.
So they say they can't reproduce the issue and I am the only user reporting it, but I found this video (a Corsair promo with George Makris from Corsair demo'ing the AX1200i to a reviewer this June) where it's happening: http://www.youtube.com/watch?v=Yv7oLWF4dZU&feature=player_embedded
Note PCIe 1 is reading 56.1 Amps = 673 Watts, while the total system power consumption is reported at 152 Watts.
I then did some more digging and I found a second Corsair employee, PR director Rick Allen, pointing at the faulty power reading while describing how you can monitor the PCIe currents:
In that same video, at At 2:28, it's doing it on PCIe1, PCIe2 and PCIe3 with 55.8 Amps reported on each (a total of over 2 kilowatts) while total power output reads 174 Watts.
So supposedly 2 different Corsair employees have demo'd this PSU while it was doing this, and neither of them noticed the software reporting that a single 8-pin connector is carrying over 50 Amps.
Supposedly their testing hasn't revealed this issue before they started selling these PSUs, even though the issue shows up on a system they are using to demo and market the product.
More here: http://forum.corsair.com/v3/showthread.php?p=612174&posted=1#post612174