Any adapters for a x16 PCIe slot split in multiple smaller ones?

Slot configurations without DWCM​ ; Riser 12, x16x8x8 , x16x16E , Ex16x16, Riser 3 ; Slot 14, PCIe x16, PCIe x16, Empty, Slot 7

Each of these mechanical PCIe slot sizes also corresponds to the number of available electrical PCI Express lanes (basically the amount of wires attached to

pciex16 slot PCIe x16 is your 16-lane PCI Express slot, or at least your largestlongest PCI Express slot It is the most high-bandwidth, high-performance expansion slot

ocean magic free slot PCIe boards can fit into slots designed for their lane configuration or higher Plugging a x4 PCIe into a x16 slot is acceptable