What Does PCIe x16 Mean?

Single Board Computers With Mini PCIe Expansion Slots pcie slot size Generally speaking, there are five physical sizes of PCIe cards: x1, x4, x8, x16, and x32 (FYI, PCIe x32 does exist with a maximum of 32 lanes, pcie slot gpu PCIe slots on a motherboard come in different sizes, referred to as “lanes” Common slot configurations include x1, x4, x8,

pcie slot x16 16x is physical slot size, that is capable of wiring up to 16 PCIe lanes, but on your motherboard that slot has only 4 lanes connected to it