Ubuntu 16.04 6x GTX 1070 Nvidia Driver Problems

Hi, I'm wondering if anyone else has had some similar issues as me. I'm trying to run 6x MSI GTX 1070 on Ubuntu 16.04. I'm able to install the latest driver (375.26) but when I type nvidia-settings it only recognizes 5 GPUs. If I type lshw -c video or lspci | grep VGA all 6 gpus are recognized though. So it must be a software problem(?).. I've tried reinstalling ubuntu multiple times as well as using different drivers..

I've been working on this for 2 days now, and have never had a problem with 6 gpus in the past.. so any help would be appreciated.

are your PCI settings configured correctly in the bios?

yup. running mutliple 6 gpu rigs with same motherboard & bios settings.

do all your cards enumerate in the BIOS (pre-boot)? if not, then your issue isn't OS related. (ie, maybe bad card or riser).