65Installing a DIMMCaution! When using multiple memory modules it isrecommended that you AVOID using modules from differentmanufacturers or that run at different speeds from each other.1 Observe the ESD precautions and pre-installation proceduresdescribed on page 39.2 Locate the DDR2 DIMM slots on the mainboard.3 Open the clips on the socket.4 Align then insert the DIMM into the socket.5 Press the holding clips inward to lock the DIMM in place.Important: Install identical size DDR2 memory modules at thesame time into the memory slots. You may install a single moduleinto the memory slot or install modules in pairs (See suggestedmemory population for memory sparing on page 62 or memorymirroring on page 63).Installation of the DDR2 memory modules must be in thefollowing sequence: 1B and 1A, 2B and 2A, 3B and 3A, and 4B and4A. Refer to the illustration on page 66 for the recommendedDIMM sequence.