Dimm; Maximum Supported Memory Size - NEC EXP805 User Manual

Chapter 2 Preparations
1.11

DIMM

Install a Dual Inline Memory Module (DIMM) to a DIMM slot on the motherboard in the server. The motherboard
provides 24 slots to install DIMMs.
The memory subsystem in this server supports LRDIMM and RDIMM.
LRDIMM supports a higher density than a single rank or dual-rank. For this reason, you can provide higher
system capacity and bandwidth by installing larger capacity DIMM.
For the information corresponding to all the types, all the types are referred to as DIMM. If you specify LRDIMM
or RDIMM, the information is applicable only to the type. It is necessary that the type of all of the memory installed
on the server is the same.

Maximum supported memory size

The maximum available memory size on the server depends on the architecture and OS specs.
Maximum memory sizes
Microsoft Windows Server 2012 R2 Standard *1
Microsoft Windows Server 2012 R2 Datacenter *1
Microsoft Windows Server 2016 Standard *1
Microsoft Windows Server 2016 Datacenter *1
Microsoft Windows Server 2019 Standard *1
Microsoft Windows Server 2019 Datacenter *1
Red Hat Enterprise Linux 7 (x86_64)
VMware ESXi 6.5 *2
VMware ESXi 6.7 *2
*1: Shown below is the maximum memory size when Hyper-V is used:
- Windows Server 2012 R2: Up to 4TB
- Windows Server 2016: Up to 24TB
- Windows Server 2019: Up to 24TB
*2: Up to 6 TB on virtual machine
 To avoid static electricity, see Chapter 1 (1.8Anti-static Measures) in Safety
Important
Precautions and Regulatory Notices.
 Use only the specified DIMMs. Installing a DIMM from a third party may
damage not only the DIMM but the motherboard. You will be charged to
repair failures or damages caused by the use of such products even within
the warranty period.
Tips Up to 3072GB (128 GB x 24) can be installed in 2-CPU configuration. Up to 1536
GB (128 GB x 12) can be installed in 1-CPU configuration. No DIMM is factory
installed in standard configuration.
Important This server does not support mix of LRDIMM and RDIMM. If you allow the mix
of any combination of these DIMM, there is a possibility that the server stops
during POST.
OS
4TB
24TB
24TB
12TB
12TB
16TB
Express5800/R120h-2M (2nd-Gen) User's Guide
1. Installing Internal Optional Devices
The maximum
memory size The maximum memory size supported
supported on each
OS
3.0TB
3.0TB
3.0TB
3.0TB
3.0TB
3.0TB
on the server
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