Probably. People used to talk about running into quantum mechanics at about the current node, but that was due to tunneling across the gate oxide layer. This is

Probably. People used to talk about running into quantum mechanics at about the current node, but that was due to tunneling across the gate oxide layer. This is being solved with new high-k dielectric materials. There's probably a whole lot more problems to be solved between now and 4 nm, though. 4 nm is really small. The silicon-silicon lattice spacing is 0.235 nm, so we're really only talking about a few atomic layers. I have no idea how they're going to build 'em that small, and I suspect that Intel's not really sure either.