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U41243-J-Z156-1-76 109
System expansions Memory expansion
The system operates in two different modes depending on how many memory
modules are installed:
– Interleaved mode (two memory modules): The memory modules share a
common address range. One memory responds to even-numbered cache
lines, while the other responds to odd-numbered cache lines. This configu-
ration offers the highest performance because it allow the two modules to be
used in a balanced fashion, reducing address conflicts.
In interleaved mode, the DIMMs must be installed in pairs (one on each
module) and in the same locations (Jx) on each module (see figure 32 on
page 109).
– Single port mode (one memory module): The single memory module
responds to all memory addresses. The DIMMs on this single carrier do not
need to be installed in pairs.
Figure 32: Main memory module
J1 J2 J3 J4
J5 J6 J7 J8 J9 J10J11 J12
J13J14 J15J16