Haha "somewhere" was in the gigabyte gtx manual (after I installed it of course), then in the designare manual when the "correct" slot didn't work, then online in a few places when troubleshooting. I've never cared about maximizing performance for gaming so PCIe slot placement had never occurred...
Weirdest thing. Been running 4 monitors for a few years on a gtx 750 no problem. I've never gamed once. I only use my video card for faster rendering with Premiere and only use my 4 monitors for workspace and never push them hard.
Anyway, just swapped out gtx 750 for gtx 1660. After swapping, I...
Exchanged MOBO for brand new exact model. Installed all 4 sticks of RAM. Fired right up. It was a bad MOBO. Lesson learned: Might be more hassle than it's worth buying an open box MOBO unless you enjoy the extra potential detective work and extra time involved. Other lesson, buy from Microcenter...
Gigabyte Z97X Gaming 7
BIOS Version F8 (flashed to latest)
Intel Core i7-4790K CPU @ 4Ghz
RAM KIT: 32GB G SKILL RIPJAWS X (F3-1066CL9Q-32GBXL)
DDR3-1333 CL9-9-9-24 1.50v
PC3-10666 8Gx4
Searched forums at length already but I've done all other basic troubleshooting all other threads suggest...