Motherboard/Windows Will not detect my 4th GPU in my computer

[Poozle]

Hey, recently did an extremely overkill build with 4 1080TIs, all watercooled in my desktop. Problem is, the motherboard (And windows) will not detect the 4th graphics card. My Motherboard is the MSI Gaming X Titanium z270 motherboard with an i7 7700k. I would like to not have to disassemble the watercooling loop, but it may be unavoidable. Driver installation of any NVidia drivers fails even when from a disk. I saw in the BIOS a 4G setting that allows for more than 4 gpus, and this may matter as I have a PCIE WIFI CARD in as well. that makes for 5 PCIE devices. The wifi card and 3 GPUS work fine, but the 4th isnt detected. I have tried to set the 4G setting on, but my computer wouldn't load into windows so I just CMOS reset. I did adjust a few settings so it could've been a couple things and I will try just the 4G setting later. Thanks! Just wanted some advice from fellow enthusiasts and if anyone has any ideas. MOBO bios is the newest, but its been updated since I got the board. Windows is latest version. The card works and is NOT broken as far as I know. I have in the past had dead PCIE slots on the board. (3rd board) first had audio issues, second had a dead PCIE SLOT. This one I think works fine as I have had the wireless card in the slot of the card that I think is not working.

 

[Elf_Knight]

I believe that Nvidia has disabled 3-way and 4-way SLI. You can only do 2-way SLI from now on as of the recent GTX 10 series of Pascal graphics cards. I could be wrong but more information should be available on the Nvidia website.

 

[rolli59]

Simple apart from the nvidia SLI support. Your platform does not have enough PCIe lanes to work 4 x PCIe 3.0 x16 slots (support x16/x0/x0/x4, x8/x0/x8/x4, x8/x4/x4/x4 modes)

 

[Poozle]

I believe that Nvidia has disabled 3-way and 4-way SLI. You can only do 2-way SLI from now on as of the recent GTX 10 series of Pascal graphics cards. I could be wrong but more information should be available on the Nvidia website.

This is true, but I'm not using all the cards in an SLI config. For example, I tested the max supported cards I could in my case (3at the time) and had 2 in sli with the third set to managing background/work tasks. So yes, SLI is no longer possible for 3+ cards, but its still possible to utilize the cards. Thanks for the reply!

 

[Poozle]

Rolli, thank you. I'm not entirely sure how to manually set pcie lanes to a pcie slot. Any chance someone could explain that better? Thanks! It sounds like I need to set one card as x8, and the rest as x1 or x8 +x8, and the rest as x1 if the wifi card doesn't truly take a lane?

 

[rolli59]

If you really have the money to blow on 4 x 1080Ti you need to be looking at top end platform to drive it either Intel or AMD which offer more PCIe lanes!