Can PCIe X4 Card Fit in X16 Slot? - Can it Work? - PC Guide 101
For x670e, the max PCIe slot configuration implemented by vendors is 3 slots with x8,x8,x4.
PCIe Cable for industrial systems - BRESSNER Technology - Shop
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Using an eGPU with a mini PC - CNX Software - cnx-software.com
A prototype GPU from Colorful featuring two M.2 SSD storage slots ... The company has divided the remaining x8 lanes, allocating x4 lanes to each SSD slot via PCIe bifurcation.