TX1320 M4 Upgrade and Maintenance Manual 209
10.1.1.2 Modes of operation
– The maximum performance can be achieved in a symmetric dual-channel
configuration. Therefore both channels have to be populated with the same
amount of memory. The DRAM device technology (1 Gbit / 2 Gbit / 4 Gbit)
may vary from one channel to the other.
– If the amount of memory differs between the two channels, the system board
will run in dual-channel asymmetric mode.
– Regardless of the mode, all DIMMs will run at the highest common
frequency that is allowed by the SPD Data of the DIMMs and the maximum
speed of the selected configuration.
– Single-channel mode is used if one memory module is populated in
DIMM 1A.
Channel A B
Slot ID 1A 2A 1B 2B
DIMM #
1o
2o o
3ooo
4oooo
Table 3: Mounting order - dual channel mode and single channel mode: Single CPU
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