Hardware options installation 56
DIMM identification
To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
Item Description Definition
1
Capacity 8 GB
16 GB
32 GB
2
Rank 1R = Single-rank
2R = Dual-rank
4R = Quad-rank
3
Data width x4 = 4-bit
x8 = 8-bit
4
Memory generation DDR4
5
Maximum memory
speed
2133 MT/s
6
CAS latency P=15
7
DIMM type R = RDIMM (registered)
L = LRDIMM (load reduced)
For more information about product features, specifications, options, configurations, and compatibility, see
the product QuickSpecs on the HP website (http://www.hp.com/go/qs).
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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