Fix Available For Incompatibility Between Corsair AX760i/AX860i and GIGABYTE Z87X-OC (Force)

In a forum post over at OCAU, Dino from GIGABYTE has posted a fix for the incompatibility issues concerning Corsair PSUs AX760i/AX860i and GIGABYTE Z87X-OC/OC Force. The issue typically presents itself as failure to boot up properly, or in rare cases sudden shutdown. According to Dino, both power supplies and boards conform to Intel 8 series design specifications. It appears to be a signaling compatibility issue between the motherboard and power supply that is causing booting issues. GIGABYTE has provided information on a confirmed fix. The fix involves the removal of a resistor that controls the OC Ignition sensor for "PSU On signal". What's more, GIGABYTE offers a service to apply the fix via RMA.

Although the fix would imply the OC or OC Force motherboard is at fault here; it is still unclear which part is causing this issue. Neither Corsair nor GIGABYTE is officially commenting on the subject. This issue seems to occur only with the mainstream AX line-up; the Corsair AX1200i power supply is fully compatible with both motherboards. So far, there has been no report of other brands or product lines with similar incompatibility issues.

Fix for Z87X-OC (left), and fix for Z87X-OC Force (right)


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Christian Ney says:

Ho, didn't know that incompatibility issue, well too late I RMAed both XD

Australia Dinos22 says:

lol resident RMA troll Ney in action already. How did it go?

Christian Ney says:

Z87X-OC got replaced no questions asked (I guess they were happy to have a board used by me :D)

AX860i, they said "it's working fine", I said "I am CN, when I say it's not, it's not" annnnnd it got replaced :p

Australia Dinos22 says:

Christian Ney said: Z87X-OC got replaced no questions asked (I guess they were happy to have a board used by me :D)

AX860i, they said "it's working fine", I said "I am CN, when I say it's not, it's not" annnnnd it got replaced :p


No doubt you linked them to your Sony and other trolls right hahah

United States l0ud_sil3nc3 says:

AX1200i working fine here with the OC board, had no idea there was ever an issue with the lower wattage units.

Australia Dinos22 says:

just those two specific models

Germany der8auer says:

Christian Ney said: Z87X-OC got replaced no questions asked (I guess they were happy to have a board used by me :D)

AX860i, they said "it's working fine", I said "I am CN, when I say it's not, it's not" annnnnd it got replaced :p


Fking epic hahaha :D

Belgium leeghoofd says:

When are you gonna RMA my 2600K Christian :p

Christian Ney says:

Email me the case and info I will have a look.

Vietnam mglushed says:

Hi, does MSI Z77 MPOWER motherboard have this issue with AX760i too? I'm experiencing random sudden shutdown/reboot (up to 20 times in 12 hours) when I use these two together. Is there a known fix for these two?

Belgium Massman says:

It is the first time I hear about this issue with the MPower. Have you tried another PSU?

Vietnam mglushed says:

Massman said: It is the first time I hear about this issue with the MPower.

Have you tried another PSU?


Yes I have tried GS600 for 30 hours and it ran fine.

Btw when AX760i shuts down I see a red light on the PSU, which normally is green I think, what would that mean?

Oh and, the fan on my AX760i won't start at Windows start, it only rotates when I play games. I tried to set it to fixed 40% in CorsairLink, it seems to extend the time before sudden shutdown issue occurs again.

I'm not sure if it's lacking of power or something, the blue LEDs on motherboard seem not very stable, when I open up a game, they seem to be dimmed down a bit, then when I minimize the game, they get brighten up again, whether PSU is used.

Belgium Massman says:

The symptoms you describe do sound familiar to the behavior on the OC board. I will check with our contacts at MSI if they have heard of similar compatibility issues. Thanks for your information!

Vietnam mglushed says:

Massman said: Okay, this is fairly interesting...


That sounds like the default fan speed setting is set too low. When my PC idle the fan stops completely. I think maybe manually setting the fan to 50 or 60 percent would do. (I tried to set it at 40% but it still fail after a while, just took longer).

Thank you for your very helpful information! I will try setting it higher when I get back home in 2 hours, I'm at work right now. If it doesn't work out then I will try putting a fan on top of it, but my case is small, don't know if it can fit.

Oh and my case is 550D, it's a silent case and the airflow is not so good. May it cause the PSU to be overheated too?

Belgium Massman says:

Overheating sounds reasonable. The fan just shuts down, though. How do I increase the Fan Speed? Is it possible without the Link software? (added videos btw)

Vietnam mglushed says:

I don't know of any software to change PSU fan speed other than CorsairLink2. I didn't know that it is even possible to control PSU's fan speed till AX***i PSUs come out.

Btw mine works exactly like yours in the video. The fan stops first then after a while the PSU shuts down.

When it shuts down at fixed 40% fan setting, I think it maybe because I ran at full load, 40% may not be enough at full load for a very long time.

By full load I mean a single GTX 680 Lightning not OC'ed, a 3770K not OC'ed cooled with a H100i cooler, 2x 4GB Dominator RAMs, a PCI-E SB Titanium sound card, a blue WD 500GB HDD and an OCZ Vertex 4 128GB SSD, playing Final Fantasy XIV ARR at max settings 1080p and another 1080p monitor playing 1080p music video on Media Player Classic, music out put through sound card's optical port to z906 speakers, video card is at ~75c and CPU is at ~65c.

Vietnam mglushed says:

Oh right, I forgot to add that some times it seems to be sleeping (case fans, CPU fans, graphic card fans still running) but cannot be woke up by hitting the keyboard, if I hit the power button, it shuts down, then when I turn it back on and read Windows' event viewer, I see the "sudden shutdown" or something like that message (with the time of the moment I press power button, so that means it still recording things till the time I press the power button), just like the times it sudden reboots or shuts down. And I have no sleep-timer enabled in Windows. I'm using Windows 8 pro x64.

Belgium Massman says:

Too bad I don't have an Asus board in house to check if the problem does not happen on their boards. Anyway, looking forward to seeing other people testing this. If this random shutdown is a problem of a specific batch of PSU, it would be cool to know what batch is affected and how to identify them. Probably by serial number. Then it's just a matter of RMA replacement, and all done.

Australia Dinos22 says:

interesting project lol

United States Bobnova says:

Shit oh dear, this might be the first time that connecting a PSU to PC hardware in a review is anything but a sign of a useless review. Damnit, corsair.

Australia Dinos22 says:

Boards that are currently sold in channel are 1.0 (4) which has a fix for corsair psus guys!

Belgium leeghoofd says:

my corsair psu also has issues sometimes with the ASRock board...

Poland Xtreme Addict says:

Good to hear Dino! :)

Australia Jimba says:

I wonder if this could be caused by the softwave on the new models? This doesnt impact the AX1200 (non i) does it?

Russian Federation _Vetal_ says:

omg, I waste several weeks with this issue and my AX760i :( I changed 3 motherboards - Asus Z87-Pro, ASRock Z87 Extreme 6 and only after with MSI Z87-G45 GAMING this issue happened too..I decide to check PSU. And with my old Enermax Modu 82+ all fine(without power off, restart, cycle restart with red led etc..)!!! Something has changed in that time?

United Kingdom nathanjames001 says:

I only just got round to fitting my ax860i that I bought 12 months ago and had this problem that it would not turn on (works on my Intel s5500BC). I googled and instantly found this site with the raised issue however was unsure what the little (4) meant in the below QUOTE.
I know my board is revision 1 but was unsure if this was the same as the mentioned ones with the implemented fix. It would appear not due to the way it is not starting up without pressing the OC Ignition switch but I could be wrong.

dinos22 said: Boards that are currently sold in channel are 1.0 (4) which has a fix for corsair psus guys!

Australia Dinos22 says:

4 is a version number of the PCB found in another corner towards PCH

United Kingdom nathanjames001 says:

Ah shoot it looks like I dont have a board with the fix then. My board is Rev 1.0 Version 2 I did contact Gigabyte and they said they were more than happy to RMA the board for me but I wasnt sure if they would need it posting with any cash or anything so I just have to wait and see. The board boots fine if I use the OC Ignition button but cant be put to sleep so the fix is kinda needed for me. Thanks anyway for clearing that up for me.

United States xxbassplayerxx says:

Have you ever removed a SMD resistor from anything? You could do this yourself in all of 10 seconds if you locate the correct resistor. Use a small, flat head screw driver and be very careful to push against the resistor with controlled force so that when it breaks free, your hand doesn't slip. If you'd feel safer, you could also use something plastic to avoid scratching the board/traces, though nothing instantly comes to mind that would work well.

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