Dual 1080ti wont post. One will

[aroscoe555]

I recently bought a second gpu. Asus turbo 1080ti. I upgraded my mobo as well. When I install both cards. The system will not even make it to bios and get stuck at post code 30. I get blackscreen. If I run one gpu. It will boot to windows. Iv tested both cards alone. Work and boot up. What the deal?
Specs
8700k
Asus maximus x formula
Asus turbo 1080ti x2
Evga 1600
32 GB ram

 

[The Paladin]

when Running dual video cards, the amount of watts you have on your power supply becomes very important, could you tell us what is the make and model of your power supply?

 

[aroscoe555]

when Running dual video cards, the amount of watts you have on your power supply becomes very important, could you tell us what is the make and model of your power supply?

Evga 1600 supernova

 

[The Paladin]

okay have you tried swapping the power cables from one video card to the other,
have you checked on web site of manufacturer to make sure you have the latest required bios to run dual video cards ? (ie updated needed?)
have you tried installing the video card single,. ie try each alone to make sure they both work ?
have you tried installing the second video card in slot 3? (blue arrow)

ref: http://dlcdnet.asus.com/pub/ASUS/mb/LGA1151/ROG_MAXIMUS_X_FORMULA/E13427_ROG_MAXIMUS_X_FORMULA_UM_WEB.pdf?_ga=2.125371786.140921139.1526123417-1793528967.1507551773

 

[aroscoe555]

okay have you tried swapping the power cables from one video card to the other,
have you checked on web site of manufacturer to make sure you have the latest required bios to run dual video cards ? (ie updated needed?)
have you tried installing the video card single,. ie try each alone to make sure they both work ?
have you tried installing the second video card in slot 3? (blue arrow)

Iv tried duel in 1 and 3. Works. But at pcie x4. My mobo tells me lane 1 and 2. If I do a single card on either 1 or 3 works as well. Single card in middle lane wont work. Could it be a bios update? I just got the board yesterday.

 

[The Paladin]

question;

1. you saying that when both cards are in lane 1 & 3 your system runs fine?
2. when you have a video card plugged in lane 2 the system refuses to boot ?


if you answer yes at both questions then you can try a bios update if needed, but it now looks like your motherboard is faulty.

 

[aroscoe555]

question;

1. you saying that when both cards are in lane 1 & 3 your system runs fine?
2. when you have a video card plugged in lane 2 the system refuses to boot ?


if you answer yes at both questions then you can try a bios update if needed, but it now looks like your motherboard is faulty.

Originally I thought so to. That's why I got a new board. I was running a asus maximus x hero before. Same issue. 1 and 3. Fine. Wont boot with 2 gpu's in 1 and 2 or just 2. Get code 30. So I bought this mobo. I find it hard to believe bad luck on two mobo with the same problem. See what I mean. Two separate boards. Both with broken 2nd slot?