Need help. System wont boot with 2 gpus

[Blacklablelive]

Iv recently got my hands on a second 1080ti. Hipeing to run SLI. Both cards are same. Tested and both work. My problem comes when. I try to boot my system with both installed. I first installed them into my asus maximus x hero. When I go to boot up. I get no display and a post code of 30. Now the screen will recognize but it’s always black and then screen goes to sleep. Ow on my mobo i know the 1st pcie slot is x16. 2nd is x8. And 3rd x4. If i plug my second card into the 2nd slot. The problem accurs. Now if i plug into the 3rd i can boot but not enable SLI do to mobo set up. I also found even one card in 2nd slot and other slots free. No boot post code 30. Had me thinking my mobo was bad. I got a new mobo yesterday. Asus maximus x formula. And all the problems I had with 1st board are same on this one. Am I doing something wrong. Both cards tested and work alone and together in none sli slots. My psu is evga 1600 supernova. I have 32 GB ram. And run a 8700k. Any help will be appreciated.

[veeg]

Hello

What wattage is your psu? The code 30 refers to the pc coming out of sleep state.

[Blacklablelive]

Hello

What wattage is your psu? The code 30 refers to the pc coming out of sleep state.

1600 watts. And yes 30. No display on screen

[Blacklablelive]

1600 watts. And yes 30. No display on screen

It will stay at that code and never change. Wont even get to bios. Just a black screen.

[veeg]

Ok.

@phillpower2 @Bruce

[veeg]

Sorry for the no replies.

@phillpower2 @Bruce

[Bruce]

both cards work individually, so cards themselves aren’t the issue.
changed motherboard, with same problem, so motherboard isn’t it.
and both cards work when both installed, so that seems to suggest a BIOS setting (seem to recall seeing SLI settings in BIOS over the years) or when the whole gang is present there is some incompatibility issue.

sorry, never played with SLI, I’ll tag out of this one.

[DOUGIE]

Hi. You need to enable SLI in the Bios and play with your clock speeds till you find the sweet spot.
You would have been better buying a Mobo with 2 X Pcie 16 slots, for SLI

[phillpower2]

Never replied to this thread as the OP has not been around since May 14th but fwiw checking for Sli drivers for the MB should have been done as should making sure that any game that the member was trying to play was compatible with Sli.

Each to their own but a single GTX 1080ti card on its own will handle any game and the second will be doing nothing unless there are multiple large screens and CAD or serious video rendering involved.