Notso

I was using the PCIe 3 x1 slot above the first GPU PCIe x16 (other 2 are covered by the video cards) and had this same issue. Plugged it into the bottom PCIe x16 (3rd) slot and issue is gone. Core i5 8600K MSI Krait Gaming Z370 3 x PCIe 3.0 x16 slots 3 x PCIe 3.0 x1 slots 16 gigs GSkillz EVGA GTX1070 x2 SLi 1K watt P.S. 1 Samsung NVME 1 Samsung M2 Sata 1 Samsung SSD 1 PNY SSD