The NVLink interconnect on all the GPUs is a huge part of it, and cannot come even remotely close to that bandwidth with consumer goods. Then the density of RAM to compute and power is huge. A single 4090 is 450 watts, for 24GB where this is 20x the memory for the same watts. 2.3Mw or so. If you say $0.14 / kwh, thats something like $325 / hour in power costs to run. Not counting additional cooling you are definitely going to need. And I am sure there is inefficiency this doesn't cover but 240v 10,000+ Amps for that?