112 Removing and Installing PartsMemoryYou can increase your computer memory by installing memory modules onthe system board. Your computer supports DDR2 memory. For additionalinformation 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 withconnectors 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 matchedmemory size, speed, and technology. If the memory modules are not installed inmatched pairs, the computer will operate, but with a slight reduction inperformance. (See the label on the module to determine the module’scapacity.) For example, if you install a mixed pair of DDR2 667-MHz andDDR2 800-MHz memory, the modules function at the slowest speed installed.Pin Number Signal Name 22-AWG Wire1 +5 VCD Red2 GND Black3 GND Black4 +12 VDC Yellow
