Expansion card mounting assembly

An expansion card mounting assembly comprising:

• a mounting structure;
• a printed circuit board (PCB) coupled to the mounting structure, wherein the PCB comprises multiple expansion card connectors on a first side of the PCB and multiple expansion card connectors on a second side of the PCB;
• expansion cards mounted in the expansion card connectors on the first side of the PCB and expansion cards mounted in the expansion card connectors on the second side of the PCB;
• and
• a moveable plate coupled to the mounting structure at an end of the mounting structure opposite of an end of the mounting structure configured to couple with the PCB, wherein the moveable plate is configured to secure opposite ends of the expansion cards that are opposite from ends of the expansion cards coupled with the expansion card connectors of the PCB,
• wherein the expansion card mounting assembly comprises multiple levels including the expansion cards mounted on the first side of the PCB at a first level of the expansion card mounting assembly, and including the expansion cards mounted on the second side of the PCB at a second level of the expansion card mounting assembly,
• wherein the mounting structure is configured to support the PCB and support the expansion cards at the first level of the expansion card mounting assembly and support the expansion cards at the second level of the expansion card mounting assembly, and
• wherein the mounting structure comprises an opening between the first level and the second level of the expansion card mounting assembly along a length of the expansion cards, wherein the opening is configured to permit airflow between the expansion cards mounted on the first side of the PCB and the expansion cards mounted on the second side of the PCB.