Gateway 7400 System Manual page 15

SCSI backplane provides the control for the hot-plug drives.
Drive cage fan provides cooling for the hot-plug drives and other internal
components.
System board tray supports the system board and makes it easier to remove
and install.
System board (See "System board" on page 8.)
Back panel fan provides cooling for system board components and additional
cooling for the power supply.
7
Interior of system