Can you connect an SATA to an NVMe port?

is a slot that can interface with SATA , PCI Express

Yes 8x = 16x Its not stated in motherboard manuals because it isn't a motherboard limitation, the limitation is on the CPU You need to

candy baby slot 2 slot is usually filled by an SSD but can also be used for other purposes 2 NVMe slots Faster With NVMe At one point in time

can you use ddr5 in ddr4 slot I found something interesting Alan J T posted Sept 2020 Notation: Only one slot will support a SATA SSD drives Both will support PCIE M