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I would also recommend to take the BIOS out of the question. Download multiple BIOS settings from ASUS webpage and try to load those, maybe that helps.

Also:

if you are using PCIe riser cable, that might be defected, if you are try to run card straight from the slot

This is also what I found :

"Are your 6 + 2 pin PCI E power cables properly connected to the VGA ports of your EVGA power supply? VGA1 and VGA2? try on VGA 3 and 4. I have a friend who had the...

Watch also this, maybe it helps.


https://www.youtube.com/watch?v=wD0OEDEqjfE

should be something like this

http://i23.photobucket.com/albums/b357/apics_/IMG_0457.jpg

Also you are using alot of pcie lanes already :

M.2_1 Slot NVMe (Boot): Samsung 960 PRO 512GB M.2-2280
M.2_2 Slot NVMe (Games): Samsung 960 EVO 1TB M.2-2280
SATA_1- Used, WD Black 1TB
SATA_2 -...

There's settings in bios to adjust the speeds for PCIe lanes. Try to adjust them manually.