M2 NVME SSD only uses 2 Lanes instead of 4 Lanes

It will not affect the videocard And as been said, the NVME slot will go to PCIe instead #2

PCIE bifurcation from 4 lanes to 2 lanes means you'll never go over half the available bandwidth per SSD, assuming it is even supported by the

m2 slot PCIe lanes to support both a PCIe x16 graphics card slot and a PCIe x4 NVMe SSD slot, but the older 12th Generation Alder

m2 pcie 40 in 30 slot 2 slots with x4 PCIE lanes each