There's a physical connector also called NVLink, yes, but the cards don't present as unified at the driver level; nvidia-smi shows "link: off" even using the br

There's a physical connector also called NVLink, yes, but the cards don't present as unified at the driver level; nvidia-smi shows "link: off" even using the bridge. It's effectively SLI, which can reduce memory bandwidth load and cross-card transfer costs, but doesn't unify the cards the way Volta (actual) NVLink does.