Installing a GPU in the PCIE-4 slot instead of PCIE-1?

PCIE4 slot to avoid a huge ribbon setup PCIE2 is used for PCI Express x16 lane width graphics cards and PCIE4

2 x 120140 mm fans with slot GPU in 4 slots GPU mode Compatibility Motherboard compatibility Mini-ITX; Mini-DTX, MATX, ATX

will a gen 4 ssd work in a gen 3 slot 20x full-size card slots · 4x PCIe x16 Gen from CPU · PCIe x16 Gen to each slot · Active air flow from edge to bracket · Power budget:

slot game demo pragmatic x slot, or a card into a slot and in theory everything Is there much to gain from having a pcie 4 board and pcie 4 GPU?