Hi everyone, I'm a new miner, I'm currently building my first mining rig using the motherboard ASRock H81 PRO BTC 2.0.
CPU: Intel G1840
4gb ram
PSU Corsair hx1200i
GPU: Galax GTX 1060
Everything is working fine but my pc cant recognise any GPU on my PCI express port number 4.
I'm using win 10 pro with latest Nvidia drivers, I also change pcie speed to gen 2 on my bios.
I tried switch card and risers but nothing happens.
If I put the GPU on pcie 5 it's working properly I don't understand why this problem.

Thanks