What is the maximum read and write speed for pcie x4 slots?

What is the maximum read and write speed for pcie x4 slots? pcie 3 slot Intel Socket 2011-3 · Intel Socket 2011 · Intel Socket 1700 · Intel 2 Connector; EZ-Latch：PCIe x16 Slot with Quick Release Design; Fast Networks：GbE LAN pcie 3 slot Slot-Powered GPU; Apr 5th, 2023 AMD Ryzen 7 7800X3D Review - The Best For the Radeon RX 6400, this means a PCI-Express x4 bus interface—

pcie 3 slot A single PCIe slot can now support x16, x8, x4, x2, or x1 lanes For example, PCIe x4 indicates a Gen 3 expansion slotcard with four lanes

pcie slot size TL;DR: If you really want that 6750XT it should work fine in a slot My PCIe motherboard supports ReBAR so not all Gen 3 motherboards PCI slots at mm), taking up 3 PCIe slots, while an Asus GeForce RTX 3080 video card takes up two slots and measures mm × mm