4 x 4 slot ✓ PCIe Gen 4x4 UD85

4 x 4 slot 4 Expansion Cards: Some expansion cards, such as those for additional USB ports or specialized processing tasks, may also use the X4 interface

PCIEX16E-Q4S is PCIe x16 edge connector to four PCIe x16 Slot Interconnect Cabling solution Supports PCI Express Gen 4 Bandwidth Power

This slot can be used as x16, x8x8, x4x4x4x4 using Bifurcation In Case of my Truenas install a 4 x NVME Board was used with the x4x4x4x4

Sonnet 4x4 and McFiver PCIe Cards

slot The system requires the PCIe bifurcation function to add more than one SSD with a full 16 lanes required for 3 or 4

Faster render performance in OTOY Octane X Mac Pro with M2 Ultra and 60 7PCIe slots Up to300Wauxiliary power One PCIe x4 gen 3 Apple IO card