Lets say the power supply is 90% efficient at full load. At 1600W output power, the power supply will draw 1777.8W from the grid. At 120V this is 14.8A. Just barely within the rating of a normal 15A power outlet, but you wouldn't want to run anything else on that circuit.

If you're buying a computer that needs that much power, you should probably be running a dedicated 20A circuit for it.

The power draw is comparable to a hair dryer.