Dell Precision 690 - Manual (Page 5)

Inside View
System Board Components
13 serial
connector
Connect a serial device, such as a handheld device, to the serial port. If
necessary, the address for this port can be modified through system
setup (see
System Setup ).
1 power supply
2 hard drive bay
3 memory shroud
NOTICE: The memory shroud holds the (optional) memory riser cards in
place; its thumbscrews must be sufficiently tight in order to secure the
risers and to avoid damage.
4 front fan
5 card fan
6 5.25-inch drive bay with 3.5-inch drive panel plate
7 5.25-inch drive bay