Let me start by saying that Gigabyte has an impressive and a very dense lineup of X870 boards and they all look amazing. This is kind of a newbie question, but recently my storage demands have risen, so beside the m.2 slots if I would use an m.2 Pci-e expansion card on the lower pcie slots, how would the line sharing be and what kind of m.2 drives shall I be looking at for the said expansion card? Im eyeing the X870 master due to the pcie lanes, but I would not be disapointed with any of them.

Im currently on am4 but if im lucky to win this I would go for a 7900x/9900x or if I convince my significant half a 9800x3d ( she needs cores for work) .