POWER SUPPLIES (PSU) RUN BEST AT 50-70% LOAD--

Running a power supply at max load will wear it out prematurely.  And, a cheap PSU at max load can fail with a fire hazard because they may be improperly rated.  A 2000W cheap PSU on a 110V (USA) circuit would likely overload the 110V circuit and could possibly cause a house fire, not just an explodong PSU.

A cheap PSU will explode when run at max load.       --scryptr