1 PCI Slot Mini-tower

Because I'm using HBA's that need the largest PCI slot, I wanted to have a simple GPU for basic purposes only 1 Piece PCI-E 16X Riser Board

We have PCI Slot Computers available with 1x, 2x, 4x, 6x, and 7x PCI slots in mini-tower, mid-tower chassis and 4U Rack mountable chassis

pcie slot length Thats why only the second slot detects it as it works in 8x mode To check if the problem is the first PCI slot or your motherboard, you need

pcie x4 in x16 slot Read in Detail How to Identify PCIe Version of Slot ➤ motherboardhow-to