Dell Dimension 2400 Series Owner's Manual page 70

Memory
Architecture
Memory connectors
Memory capacities
Minimum memory
Maximum memory
Memory type
Drives
Externally accessible
Internally accessible
Ports and Connectors
Externally accessible:
Serial
Parallel
Video
Keyboard
Mouse
USB
Network
Audio
Headphone
70
Appendix
DDR SDRAM
two
128-, 256-, or 512-MB
128 MB shared DDR SDRAM
NOTE: Between 32 and 64 MB of system memory may be
allocated to support graphics, depending on system
memory size and other factors.
1 GB
PC2100 (266-MHz) or PC2700 (333-MHz) DDR
SDRAM (non-ECC)
two 5.25-inch bays
one 3.5-inch bay
one bay for 1-inch–high IDE hard drive
9-pin connector; 16550C-compatible
25-hole connector (bidirectional)
15-hole connector
6-pin mini-DIN connector
6-pin mini-DIN connector
two front-panel and four back-panel USB
2.0–compliant connectors
RJ-45 connector
three back miniature connectors for line-in, line-out,
and microphone
one front miniature connector for line-out