Cool GTXCPU & PCIe lane with the M.2 ?... I'll have to look in the Manual I have the Same MB with Two 2080 Ti running now but am using SATA SSD drive X99 FTW-K manual PE1 & PE5 are the correct PCIe slots for your 40 lane CPU using M.2 Disables PE6 Looks like it Could be: CPU, CPU socket / bent pin or PCIe slot OR a GPU issue Which GPU model do you Have ---> Says FTW3 in your signature Test the second Video Cards BIOS IF you run the GPU-Z built in GPU test - does the PCIe state change ? If you swap the Card's positions --> does the x4 speed move with the GPU ?
esschallertSo finaly yesterday I had the time to renew the water and check if it was a problem with the PCIe slot. I've removed both GPU's no viewable dirt on the socket but I used air pressure to clean it nonetheless. I don't know if it was dirt or maybe they weren't seated right. But after a boot it showed both GPUS with 16x so it's working now.Funny though, if it was really runnning with 4x even in Benchmarks then there was no big difference to 16x.