PCIe RAID 1: CPU slot + Chipset slot or 2x Chipset slots?

-Is it possible to split an slot into 2 or 4 slots? Some motherboards do support PCIe bifurcation, but even on systems that do support

There are some NVMe drives that are designed to fit into a standard PCIe motherboard slot much like a graphics card, but most NVMe drives use

does the pcie slot matter for gpu Out of habit, I use _1 as an OS drive But this may no longer be the best option for gaming PCs with games that use Direct Storage

does slot open on sundays 2 SSDs are connected directly to the motherboard in an socket as opposed to traditional SATA based drives that rely on using cables to connect to the