Removal and replacement procedures 74
DIMM identification
IMPORTANT: This server does not support mixing RDIMMs and UDIMMs. Attempting to mix these
two types causes the server to halt during BIOS initialization.
The memory subsystem may be populated with either RDIMMs or UDIMMs, but mixing
the two types is not supported. To determine DIMM characteristics, use the label
attached to the DIMM and the following illustration and table.
Figure 56 DIMM identification
Item Description Definition
1 Size —
2 Rank 1R = Single-rank
2R = Dual-rank 4R = Quad-rank
3 Data width x4 = 4-bit
x8 = 8-bit
4 Memory speed 10600 = 1333-MHz
8500 = 1067-MHz
5 DIMM type R = RDIMM (registered)
E = UDIMM (unbuffered with ECC)
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