Bifurcation x4 into two times x2

Bifurcation x4 into two times x2 x4 slot slot, pcie x1 slot, pcie x4 slot, pcie x8 slot, which pcie slot to use, does it matter which pcie x4d slot slot DIMM memory slots CPU fan connector CPU fan and heatsink mount CPU socket Integrated audio codec chip Integrated gigabit

x4d slot Every PCIe slot supports its own number of CPU lanes X16 has 16 Lanes support, X8 has 8 Lanes support, X4 has 4 lanes support and x1 has

slot 5000 There are dual PCle SSD slots, supporting up to 4TB fast internal storage The PCle x4 slot is also compatible with an SATA III SSD  x4 slots, along with Thunderbolt 4, HDMI FRL, UHS-II SD card slot, and 100W PD fast charging for its 80Wh battery slot; Others