1080 troubles with PCI-e

[b.choteborski]

So, yesterday I switched my 1060 for new 1080 (nice and clean switch, with DDU), and I experienced a WORST performance in many games. 20-30 fps lower then on 1060. Started to sniff around on what's causing it and I noticed that the LED under my PCI-e port is white (on 1060 it was red), so I checked the mobo manual and white means it's running on x2,x4 or x8 mode (red is x16). Also confirmed it with GPU-z, its running on x4 (and yes, its still running on x4 while rendering - 99% gpu load).

I have only one GPU and its connected on the same main x16 PCI-e port that 1060 was on.

Things I tried:
1) Reinstaling display drivers after uninstaling them, and cleaning with DDU
2) Flashing mobo BIOS with the latest version
3) Confirmed that the power setup for PCI-e on both Nvidia settings and windows settings is on max performance mode.

My specs:
MSI z370 SLI plus
I7 8700k
Corsair H60
G.SKILL Trident Z - RGB 3000
AIM SC 808 - on PCI-e x1
Chieftec A-90 GDP-650c - 650w
SSHD Seagate FireCuda with Optane 32 GB

Please help, my cancer is getting biger and biger with every second of this nightmare

 

[Cioby]

Have you tried one of the 3 other slots for PCI-E?