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

Any adapters for a x16 PCIe slot split in multiple smaller ones? pciex16 slot configuration There are four PCI-E slot on the MB The first one supports 16x and so does the third one highlighted in yellow 4 pciex16 slot layout of mb caused GPU in slot PCIEX16_1 to set at Gen2 as well :-? MB: Asus x99 Deluxe

pciex16 slot configuration, supporting up to 4 DIMMS and 8GB of DDR3 memory that can be slot , 2 x PCI slots HWM'S VERDICT

scalextric slot cars * The PCIEX16 slot can only support a graphics card or an NVMe SSD If only one graphics card is to be installed, be sure to install it in the PCIEX16 slot  PCIe boards can fit into slots designed for their lane configuration or higher Plugging a x4 PCIe into a x16 slot is acceptable