Hardware options installation 46
Dual- and quad-rank DIMMs provide the greatest capacity with the existing memory technology. For
example, if current DRAM technology supports 2-GB single-rank DIMMs, a dual-rank DIMM would be 4-
GB, and a quad-rank DIMM would be 8-GB.
DIMM identification
To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
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 Voltage rating
L = Low voltage (1.35v)
Blank or omitted = Standard
5 Memory speed
10600 = 1333-MHz
8500 = 1066-MHz
6 DIMM type
R = RDIMM (registered)
E = UDIMM (unbuffered with ECC)
For the latest supported memory information, see the QuickSpecs on the HP website
(http://www.hp.com
).
Memory configurations
To optimize server availability, the server supports the following AMP modes:
• Advanced ECC—provides the greatest memory capacity for a given DIMM size, while providing up
to 4-bit error correction. This mode is the default option for this server.
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