slot pcie x16 ✓ PCIe X16 vs X8 with 4 x Titan V GPUs for Machine Learning

slot pcie x16
PCIe boards can fit into slots designed for their lane configuration or higher Plugging a x4 PCIe into a x16 slot is acceptable slot pcie x16 Does anyone know of any adapters that can convert a single x16 slot into 4 x4 slots? I've searched around but I cannot find any decent risers or riser cards

slot pcie x16Expansion Backplane, One PCIe x16 slot

slot pcie x16 I see many mobos have two PCI-E x16 slots, where the primary PCI-E x16 is for my gpu, but 2nd one only supports up to x4 or something