What is PCIe ?

What is a PCIe slot with an x4 slot and x16 connector? pcie x4 in x16 slot 2 NVME or AHCI SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4 x8 x16 Slot pciex1_1 slot PCI-ExpressはPCIeやPCI-Eともよばれる場合がありますが、基本的に 2 PCIe Gen3 x4 slot×1○USB： USB

pcie slot for gpu PCIe slots have multiple sizes, including PCIe x16 slots, PCIe x8 slots, PCIe x4 slots, and the smallest PCIe x1 slots When getting peripheral