Mac Pro : Limits and possibilities of PCIe slots

20x full-size card slots · 4x PCIe x16 Gen from CPU · PCIe x16 Gen to each slot · Active air flow from edge to bracket · Power budget:

The size represents the number of direct connections provided by either a PCIe slot or card These connections are typically called lanes and,

pcie 2 slot Card capacity and size · Slot 1: gen 4, up to x16 lanes · Slot 2: gen 4, up to x16 lanes · Slot 3: gen 4, up to x8 lanes

pcie slot function length) Thickness: mil ±10% Note: Reserve two adjacent PCIe slots to Length: inches Thickness