Dell Inspiron 531s (Mid 2007) - Manual (Page 112)

112
Removing and Installing Parts
Memory
You can increase your computer memory by installing memory modules on
the system board. Your computer supports DDR2 memory. For additional
information on the type of memory supported by your computer, see
"Memory" on page 167.
NOTICE:
Do not install ECC or buffered memory modules. Only unbuffered,
non-ECC memory is supported.
Memory Installation Guidelines
• DIMM connectors must be populated in a numerical order, beginning with
connectors DIMM_1 and DIMM_2, then connectors DIMM_3 and DIMM_4.
If a single DIMM is installed, you must install it in connector DIMM_1.
• For best performance, memory modules should be installed in pairs of matched
memory size, speed, and technology. If the memory modules are not installed in
matched pairs, the computer will operate, but with a slight reduction in
performance. (See the label on the module to determine the module’s
capacity.) For example, if you install a mixed pair of DDR2 667-MHz and
DDR2 800-MHz memory, the modules function at the slowest speed installed.
Pin Number Signal Name 22-AWG Wire
1 +5 VCD Red
2 GND Black
3 GND Black
4 +12 VDC Yellow
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