Rack server chassis, and rack server

A rack server, comprising:

• a rack server chassis including:
• a housing base and mutually opposite side walls that are disposed on said housing base;
• a first and a second fan fastening plate which are disposed in the rack server chassis and configured in such a manner that between the two fan fastening plates one or a plurality of fans are fixable to the fan fastening plates, wherein the first fan fastening plate is fixed at a predetermined position in the rack server chassis;
• and
• a first fastening means which corresponds to a first assembly position of the second fan fastening plate and by means of which the second fan fastening plate is releasably fixed to the rack server chassis, wherein the rack server chassis has a second fastening means which corresponds to a second assembly position of the second fan fastening plate such that the second fan fastening plate can selectively be releasably assembled at the first assembly position or the second assembly position in the rack server chassis, and
• the one or the plurality of fans which between the two fastening plates are fixed to the latter.