Question: why are more pcie lanes better?
Answer: When all PCIe bus lanes are being used on a PC, your PC negotiates which device gets how much PCIe bandwidth. Most of the motherboards we use in our systems use the latest version of PCIe (PCIe 3.0). PCIe 3.0 has almost doubled the effective bandwidth (after overhead) of each PCIe bus lane when compared to PCIe 2.0.