
5
■ Each DIMM within a pair should be identical in technology. For example, you cannot mix a 256 MB
9-device DIMM with a 128MB 18-device DIMM on the same channel.
NOTE: To identify which DIMM technology you are using, compare the memory size and number of
DRAM components on the module. A 128 MB DIMM has 18 DRAM components that fully populate both
sides of the module. A 256MB DIMM has 9 DRAM components; four on one side, five on the other.
■ The first pair of DIMMS should be installed in slots 1 and 2. The DIMM slots are numbered
sequentially. Slot 1 is closest to the CPUs.
■ The second pair of DIMMS, if any, should be installed in slots 3 and 4.
■ DIMMs must be installed correctly. Be sure to match the keyed slot on the DIMM with the tab on the
DIMM socket.
■ For optimal system performance, DIMMs should be installed in identical pairs in the following three
configurations: slot 1 and 2, slot 3 and 4, or all DIMM slots populated in paired format.
■ If you are using a single DIMM configuration, the DIMM should be installed in slot 1 or slot 3.
NOTE: Although a single-DIMM configuration is possible, it does not provide the optimal system
performance that a dual-DIMM (dual-channel) of matching sizes, configuration provides.
■ If you are installing two DIMMs of different sizes, they can only be installed in slot 1 and slot 3
with each DIMM occupying either slot.
NOTE: Although a mixed size dual-DIMM configuration is possible, it does not provide the optimal
system performance that a dual-DIMM (dual-channel) of matching sizes, configuration provides.
■ No other memory configurations are supported. Attempts to install memory in other configurations
will result in unpredictable system performance.
NOTE: The following table provides acceptable pairing configurations but do not cover all module
capacities. However, the same pairing configuration applies regardless of the module type and capacity.
Table 1 - Available Memory Configurations for the xw6000
Channel A Channel B
Module
Total
Slot
XMM1
Slot
XMM3
Slot
XMM2
Slot
XMM4
29-device Empty 9-device Empty
2Empty
18-device Empty 18-device
2 18-device Empty 18-device Empty
2Empty 9-device Empty 9-device
4 18-device
9-device 18-device 9-device
49-device18-device 9-device 18-device
NOTE: Modules must be paired as indicated in this table where slots 1 and 2, and slots 3 and 4
must contain like modules.
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