S1A: PCIPCIe Gen 2, 2 PCI and 2 PCIe slots

PCIe slots on a motherboard come in different sizes, referred to as “lanes” Common slot configurations include x1, x4, x8,

The full-height PCIe adapter slots are located on the left side of the expansion node and are numbered 1 and 2

pcie x1 in x16 slot PCIe x1: These are the smallest PCIe slots, used for almost any other cards like average network adapters and USB expansion cards · PCIe x4:

pcie slot height Expansion card riser specifications ; Slot 1, Riser 1, Low Profile, Half length, x16 ; Slot 3, Riser 2c, Low Profile, Half length, x16