HP Integrity rx7620 Server - User Service Guide, Sixth Edition

DIMMs must be loaded in sets of two at specified locations on the cell board. Two DIMMs are
called an “echelon”, so two echelons would be equivalent to four DIMMs, three echelons would
be equivalent to six DIMMs and so on. The DIMMs must be the same size in an echelon. The
DIMMs across all cells in a partition should have identical memory loaded. Figure 1-9 shows the
DIMM slot layout on the cell board. For DIMM load order, see Table 1-4.
A quad seen in Figure 1-9 is a grouping of four DIMMs. Configurations with 8 or 16 DIMM slots
loaded are recommended. The DIMM sizes in a quad can be different but the DIMMs in an
echelon must be the same size.
Table 1-4 DIMM Load Order
Quad LocationDIMM Location on Cell
Board
Action TakenNumber of DIMMs Installed
Quad 00A and 0BInstall First2 DIMMs = 1 Echelon
Quad 11A and 1BAdd Second4 DIMMs = 2 Echelons
Quad 22A and 2BAdd Third6 DIMMs = 3 Echelons
Quad 33A and 3BAdd Fourth8 DIMMs = 4 Echelons
Quad 04A and 4BAdd Fifth10 DIMMs = 5 Echelons
Quad 15A and 5BAdd Sixth12 DIMMs = 6 Echelons
Quad 26A and 6BAdd Seventh14 DIMMs = 7 Echelons
Quad 37A and 7BAdd Last16 DIMMs = 8 Echelons
Figure 1-9 DIMM Slot Layout
Detailed HP Integrity rx7620 Server Description 25