Dell Servers Solution Resources User guide
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Server and Infrastructure
Engineering
Internal Use - Confidential
2
nd
Generation Intel Xeon Scalable Processors:
Balanced Memory Reference Guide
When DIMMs are populated in an unbalanced or near balanced
fashion, memory bandwidth can be reduced by up to 33% from its
maximum potential. PowerEdge customers seeking maximum memory
bandwidth and minimized memory access latency should populate
DIMMs in a balanced configuration. Populating memory in accord with
the guidelines in this technote will ensure optimized performance.
Guidelines for Balanced Memory
1. Memory modules configured to CPU must have identical properties
• Identical capacity/size, speed, rank and DIMM type
2. Memory subsystems are identically populated
• Channels must be fully populated with one or two DIMMs
3. All server sockets should have identical memory configurations
Memory Population Table
DIMMs per CPU
Configuration Type
Recommended (Y/N)
1
Near Balanced
N
2
Near Balanced
N
3
Near Balanced
N
4
Near Balanced
N
5
Unbalanced
N
6
Balanced
Y
7
Unbalanced
N
8
Near Balanced
N
9
Unbalanced
N
10
Unbalanced
N
11
Unbalanced
N
12
Balanced
Y
If you are interested in reading the full white paper on balanced memory, please click here
If you are interested in further understanding Intel CPU/DIMM supportability, please click here
Tech Note by
Matt Ogle
Trent Bates
Summary
Understanding how to
configure balanced
memory on a PowerEdge
server running Intel®
Xeon™ scalable
processors (CPUs) is
critical for securing high
memory bandwidth and low
memory access latency.
This tech note explains the
required guidelines that
must be obeyed to achieve
balanced memory, as well
as supporting tables and
illustrations for visual
clarity.
Copyright © 2019 Dell Inc. or its subsidiaries. All Rights Reserved. Dell, EMC and other trademarks are trademarks of Dell Inc. or its subsidiaries
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