Pcie Sizes (RELIABLE)

PCIe slots are measured by their width. Generally, a larger slot can handle more data lanes, but backward compatibility allows smaller cards to fit in larger slots.

The longest slot at roughly 89 mm. It is the "superhighway" reserved for graphics cards (GPUs) and AI accelerators that require massive bandwidth. Physical vs. Electrical Sizes Question - Difference between pciE electrical an mechanic pcie sizes