HP rp7405, User Manual, Page: 55 / 146

Chapter 2
Installation
Unpacking the Server
33
Different densities of main DIMMs can be mixed within a system, but each set of four DIMMs must be
identical. A set of DIMMs is defined as the group of four DIMMs that must be loaded together on a cell board.
Each cell board has four sets of DIMM slots, and they must be populated in order. Figure 2-19 shows the order
in which the DIMM slots must be populated.
Figure 2-19 DIMM Loading Sequence
Block 1 shows the minimum memory configuration per cell board. Each cell board, therefore, could have up to
four different density DIMMs (if there were that many), as long as each set of four are identical. Box 2 and
Box 4 show the more optimal memory configurations, because loading DIMMs in sets of eight takes
advantage of the pipelined structure of the memory interface of the CC.