Hi I'm looking to clarify how the rMBP late 13 Samsung pcie flash drives compare. I understand the 1TB connects at 4 lanes. I own a rMBP with a 512g that connects at 2 lanes. Is that number of lanes from the drive, or the connection/cable? If I pull that drive out for a 1TB, it will run at 4 lanes at greater r/w speed? If I use that 512g in another machine with a 4 lane adapter, is it limited to 2 lanes or will it be able to connect at 4 lanes? Thanks.