What that means is actually very simple. A 1x pcie has a single data line, a 4x pcie has 4 data lines, 8x pcie has 8 data lines, and you catch the drift. PCIE PCI Express 4X to USB 3.1 Gen 2 (10 Gbps) 2Port Those can be used for sound cards, network cards, modem, additional usb or firewire cards, or several other types of cards. Laptop pci slot types . If your laptop or tablet. Pci slots can handle 64 bits of data at a time, twice as fast as isa slots, which can only handle 32 bits of data at a time. This is the ideal way to check a pci express slot version for most users. This slot reads tiny microsd memory cards, the kind that smartphones use for external storage. Before going into the world of a pci expansion slot, we first need to know some basic terminologies. Generally speaking, there are five physical sizes of pcie cards: The traditional mini pci slot (shown first) , the full height mini pcie slot (shown second) , and the half height mini pcie slot (shown l...