MSI X2 User Guide - Page 24

MS-9273 Server Memory The mainboard supports up to twelve 240-pin 533/667MHz ECC DDRII FB-DIMM slots to provide the maximum of 48GB memory capacity. For more information on compatible components, please visit http://www.msi.com. tw/program/products/server/svr/pro_svr_qvl.php. DDRII 240-pin, 1.8V 64x2=128 pin 56x2=112 pin Memory Population Rules This mainboard supports DDRII 533/667 FBD memory interface. Each DIMM slot supports up to a maximum size of 4 GB. Users can install either singleor double-sided modules depending on their needs. DIMM41 DIMM42 Channel 4 DIMM43 DIMM11 DIMM12 DIMM13 Channel 1 Dual Channel DIMM21 DIMM22 Channel 2 DIMM23 DIMM31 DIMM32 Channel 3 DIMM33 Dual Channel Important 1. To enable successful system boot-up, always insert the memory modules into the DIMM 11 first (Channel1/ 1st). 2. In dual-channel mode, Channel 1 works in pair with Channel 2 while Channel 3 works in pair with Channel 4. In other words, Channel 2 cannot work independently with Channel 1 unplugged and Channel 4 cannot work alone with Channel 3 unplugged. Channel 3 & 4 cannot work when Channel 1 & 2 are unplugged. 3. In dual-channel mode, DIMM modules must be of the same type and density. 2-4