X99S GAMING 9 AC Not booting - Debug 94 code - Issue with GTX 980 SLI in WoW


New member
Nov 3, 2014
Hello, I bought the X99S GAMING 9 AC motherboard but have ran into some issues.

The computer won't boot when I put my second MSI GTX 980 Gaming 4 GB card in the last PCEI 3.0 port (PCIE port 5) and I get the debug LED message 94 on the motherboard. I have a SLI setup.
The first card I have in the second PCIE 3.0 port due to the Noctua U14S CPU fan takes up space for the first slot. So I have been running my grafic cards in PCIE slot 2 and 4 with some issues.

First the card in slot 2 gets really warm over 86 celsius. And second: SLI runs really poorly in World of Warcraft. I get a lot higher performance with just one card activated. I am not sure if it's cause I am not running my cards in the recommended PCIE 3.0 ports or because WoW has some issues with SLI, but I heard other people have no issues at all with WoW in SLI.
I got the same issue with 3Dmark firestrike, the cards perform really poor in SLI. I get higher score with SLI turned off..

Though SLI seems to run pretty well in 3dmark 11 and Diablo 3 Reaper of Souls.

But the main issue right now, is that the computer won't boot with the grafic cards in PCIE port 2 and 5. The solution to run them next to each other is not good, cause it gets really hot and I get bad performance in WoW and Firestrike.
Picture of my setup before I switched places with the grafic cards as you can see, it is really tight:

Any upcoming bios updates (got v1.3) that will solve this issue on the horization? Hopefully this get sorted out really soon..

My whole computer setup:
Intel i7 5820K | MSI X99S Gaming 9 AC (bios 1.3) | SLI MSI GTX 980 Gaming 4GB | Samsung 850 Pro 512 GB | WD Red 4TB | G.Skill Ripjaws DDR4 3000MHz 4x4GB | EVGA SuperNOVA P2 1000W | Noctua NH-U14S PnP | Fractal Design Define XL R2 | 5 Noctua NF-A14 PWM 140mm fans | Windows 7 Pro 64 bit


Active member
Aug 21, 2014
Try the test with one vga each time, dunno if it's the card issue? And driver version?


New member
Oct 31, 2014
You must use the recommended PCIE slots as the manual says for your CPU type, PCIE #1 and PCIE #4 if I remember, just open the manual :p for optimal 2Way SLI, also your 5820k will limit to 28 pcie lanes only if you plan to add more vgas...the other problem is your giant CPU air cooler blocking PCIE#1, do a favor to yourself, buy a watercooler for your 5820k and your problems are gone, add some overclock in your system, low noise and better temps.

Here I use 3x980 in SLI with X99S Gaming 9 AC, going soon to WC the VGAs with EK blocks.....3way is far more temperature critical than 2way spaced one.