Dell XPS 630i Service Manual page 26

NOTICE:
Do not install ECC memory modules.
• If you install mixed pairs of PC2-4300 (DDR2 533-MHz) and PC2-5300
(DDR2 667-MHz) memory, the modules function at the speed of the
slowest module installed.
• Ensure that you install a single memory module in DIMM connector 1, the
connector closest to the processor, before you install modules in any other
connector.
.
A matched pair of modules in DIMM
connectors 1 and 2 (white securing
clips)
NOTICE:
If you remove your original memory modules from the computer during a
memory upgrade, keep them separate from any new modules that you may have,
even if you purchased the new modules from Dell. If possible, do not pair an original
memory module with a new memory module. Otherwise, your computer may not
start properly. You should install your original memory modules in pairs either in
DIMM connectors 1 and 2 or DIMM connectors 3 and 4.
NOTE:
Memory purchased from Dell is covered under your computer warranty.
26
Memory
A
B matched pair of memory modules in
DIMM connectors 3 and 4 (black
securing clips)
B