pci express x1 vs x16|Difference Between PCIe x1 vs x16 : iloilo Main Differences Between PCIe x1 and x16. Generally, the number AFTER the “x” denotes the number of PCIe lanes. So, for instance, an x1 slot connects to a single PCIe lane, whereas an x16 slot has 16 routes IDEALLY (but not always; read on). [Free shipping]3500W solar street light outdoor waterproof IP67 heavy duty rechargeable led lights stable outdooor lighting solar lights with solar panel original motion detector remote control Solar flood light Street Lamp buy 1 take 1 .