A fully configured server weighs nearly of 3700 lbs (1678 kg), and it could weigh more depending on how you cable the server. While the loading is over an area of around 2.75 ft x 3.75 ft (838 mm x 1143 mm), the true stress of the server weight is over the four casters and four leveling feet.
The server has a caster and an adjacent leveling foot at each corner of the server, so each corner of the bears almost 1000 lbs (454 kg) of the server's weight. If a caster and leveling foot are located in the center of a raised floor tile, that tile bears this nearly 1000 lbs (454 kg) load. The floor tile and underlying supports must be able to accommodate this load.