Im using:

ASUS Prime Z270-P
6 x MSI RX 580 8GB Hynix memory
64-bit Windows 7


Board has 4x 1x PCIE and 2x 16x PCIE.

If I plug same card in all 1X PCIE it's working. If I plug in two 16x PCIE, computer doesn't recognise the card.

Is it fault 16X PCIE ports ( faulty motherboard) or is some settings in BIOS ?