Enthusiasts will build systems with 3 x GPUS (16 PCIe 3.0 lanes each) + 2 x M.2 (4x PCIe each) = 56 PCIe lanes, just for peripherals. Workstations might use on

Enthusiasts will build systems with 3 x GPUS (16 PCIe 3.0 lanes each) + 2 x M.2 (4x PCIe each) = 56 PCIe lanes, just for peripherals. Workstations might use one or more 10GbE (4x PCIe each) and even 40Gb/s infiniband devices (8x or more PCIe.) Not hard to use these up when you're going big.