HP Apollo 4200 Gen9, Руководство пользователя

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Hardware options installation 115
Dual- and quad-rank DIMMs provide the greatest capacity with the existing memory technology. For
example, if current DRAM technology supports 8-GB single-rank DIMMs, a dual-rank DIMM would be 16
GB, and a quad-rank DIMM would be 32 GB.
LRDIMMs are labeled as quad-rank DIMMs. There are four ranks of DRAM on the DIMM, but the
LRDIMM buffer creates an abstraction that allows the DIMM to appear as a dual-rank DIMM to the
system. The LRDIMM buffer isolates the electrical loading of the DRAM from the system to allow for faster
operation. This allows higher memory operating speed compared to quad-rank RDIMMs.
DIMM identification
To determine DIMM characteristics, see the label attached to the DIMM and refer to the following
illustration and table.
Item Description Definition
1
Capacity 8 GB
16 GB
32 GB
64 GB
2
Rank 1R = Single-rank
2R = Dual-rank
4R = Quad-rank
3
Data width on DRAM x4 = 4-bit
x8 = 8-bit
4
Memory generation DDR4
5
Maximum memory speed 2133 MT/s
2400 MT/s
6
CAS latency P=15
T=17
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 Hewlett Packard Enterprise website (
http://www.hpe.com/info/qs
).
Memory configurations
To optimize server availability, the server supports the following AMP modes:
•
Advanced ECC—Provides up to 4-bit error correction. 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