Dell Precision T7400 User's Guide - Page 173

NOTICE: Full-length heat spreaders (FLHS) are required for all DIMMs. NOTE: Memory purchased from Dell is covered under your computer warranty. Fully Buffered DIMM (FBD) Memory Overview For optimal performance, fully buffered DIMMs (FBDs) should be installed in matched sets of four. This enables quad-channel operation and provides the highest memory bandwidth. The sets of four must be matched in size, rank, and organization. This information can normally be found on the FBD label. For example, the label of each FBD in a set of four might read: 1G 2R x8, in which 1G represents the size of the memory module, 2R represents the number of ranks, and x8 represents the organization. NOTICE: Full-length heat spreaders (FLHS) are required for all memory. 1 2 1 fully buffered DIMM 2 information label Memory Installation Fully buffered DDR2 memory modules can also be installed in pairs of two; in this case, the computer will continue to operate, but with a slight reduction in performance. The pairs must be matched in size, rank, and organization. Install memory modules in order of their labels on the system board; matched sets of four should be installed first into DIMM slots 1-4 and then into DIMM slots 5-8 on the system board. Pairs of memory should be first installed into slots DIMM_1, and DIMM_2, then DIMM_3 and DIMM_4, and so on. Adding and Replacing Parts 173