For my new system, I'm debating between b450 and x570. If I go b450, I'm gonna get the msi Tomahawk Max. Idk what x570 board to get if I go x570. The deciding factor for me it's whether I need PCIe gen 4 or not. Can someone explain the advantages and future-proofing of PCIe gen 4 and whether or not it is worth the extra $50 or so to get a x570 mobo with PCIe gen 4?