Cisco UCS C480 M5 Guide

Cisco UCS C480 M5 Memory Guide
8
Memory Configurations and Modes
■ Four CPUs must be installed when using DCPMMs.
■ For Memory Mode and App Direct Mode, install a minimum 2 DCPMMs and 6 DIMMs per CPU
■ When either Memory Mode or Mixed Mode is used, the recommended ratio of DIMM capacity to
DCPMM capacity is between 1:16 and 1:4, and 1:4 achieves the best performance. For example, 6x
16 GB DIMMs + 2x 256 GB DCPMMs is a capacity ratio of 1:5.33 (96GB:512GB). In Mixed Mode, the
ratio is between memory and only the volatile portion of the DCPMMs. This ratio requirement does
not apply to App Direct mode. See Table 3 for DCCPM memory modes.
Table 3
Intel
®
Optane
TM
DC Persistent Memory Modes
App Direct Mode: DCPMM operates as a solid-state disk stora
ge device. Data is saved and is
non-volatile. Both DCPMM and DIMM capacity counts towards CPU tiering
(both DCPMM and DIMM capacities count towards the CPU capacity limit)
Memory Mode:
1
DCPMM operates as a 100% memory module. Data is volatile and DRAM acts
as a cache for DCPMMs. Only DCPMM capacity counts towards CPU tiering
(only the DCPMM capacity counts towards the CPU capacity limit). This is
the factory default mode.
Mix Mode: DRAM as cache. Only DCPMM capacity counts towards CPU tiering (only the
DCPM
M capacity counts towards the CPU capacity limit).
Intel
®
Optane
TM
DC Persistent Memory Modes
■ For each memory channel with both a DCPMM and a DIMM installed, the DCPMM is installed in
channel slot 2 (closest to the CPU) and the DIMM is installed in channel slot 1.
■ To maximize performance, balance all memory channels
■ In configurations with DCPMMs installed, memory mirroring is supported, with two restrictions:
DIMM
to
DCPMM
Count
CPU 4 (upper bay)
iMC1
iMC0
Channel 2 Channel 1 Channel 0 Channel 2 Channel 1 Channel 0
M2 M1 L2 L1 K2 K1 J2 J1 H2 H1 G2 G1
6 to 2 DIMM DIMM DCPMM DIMM DIMM DIMM DCPMM DIMM
6 to 4
DIMM DCPMM DIMM DCPMM DIMM DIMM DCPMM DIMM DCPMM DIMM
6 to 6 DCPMM DIMM DCPMM DIMM DCPMM DIMM DCPMM DIMM DCPMM DIMM DCPMM DIMM
Notes:
1. All systems must be fully populated with four CPUs when using DCPMMs at this time.
Notes:
1. For Memory Mode, the Intel-recommended DIMM to DCPMM capacity ratio in the same CPU socket is from 1:4 to
1:16.
Table 2 2
nd
Generation Intel
®
Xeon
®
Scalable Processor DIMM and DCPMM
1
Physical Configurations (quad
socket)

Cisco UCS C480 M5 Specifications

General

Brand	Cisco
Model	UCS C480 M5
Category	Server
Language	English