Hardware options installation 55
DIMM identification
To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
Item Aspect 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 (1.35 V)
U = Ultra low voltage (1.25 V)
Blank or omitted = Standard
5
Memory speed 12800 = 1600 MT/s
10600 = 1333 MT/s
8500 = 1066 MT/s
6
DIMM type R = RDIMM (registered)
E = UDIMM (unbuffered with ECC)
L = LRDIMM (load reduced)
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 up to 4-bit error correction and enhanced performance over Lockstep mode.
This mode is the default option for this server.
• Online spare memory—provides protection against failing or degraded DIMMs. Certain memory is
reserved as spare, and automatic failover to spare memory occurs when the system detects a DIMM that
is degrading. This allows DIMMs that have a higher probability of receiving an uncorrectable memory
error (which would result in system downtime) to be removed from operation.
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