Pcie Sizes

Roughly 39 mm in length. This size is the modern standard for M.2 NVMe SSD adapters and high-speed 10GbE network cards .

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