Dell Precision T3400 (Late 2007) - Manual (Page 158)

158
Adding and Replacing Parts
NOTE:
Always install memory modules in the order indicated on the system
board (see "System Board Components" on page 148).
Recommended memory configurations are:
– A pair of matched memory modules installed in connectors DIMM_1
and DIMM_2
or
– A pair of matched memory modules installed in connectors DIMM_1
and DIMM_2 and another pair of matched memory modules installed
in connectors DIMM_3 and DIMM_4
• If mixed pairs of memory modules are installed, the modules function at
the speed of the slowest module.
• Install a single memory module in the DIMM_1 connector (see "System
Board Components" on page 148) before installing modules in the other
connectors.
• When installing memory modules, do not mix ECC and non-ECC
memory.
A matched pair of memory modules in connectors DIMM_1 and
DIMM_2 (white securing clips)
B matched pair of memory modules in connectors DIMM_3 and
DIMM_4 (black securing clips)
B
A