• RDIMMs offer address parity protection.
• LRDIMMs support higher densities than single- and dual-rank RDIMMs, and higher speeds than quad-rank
RDIMMs. This support enables you to install more high-capacity DIMMs, resulting in higher system
capacities and higher bandwidth.
All types are referred to as DIMMs when the information applies to all types. When specified as LRDIMM or
RDIMM, the information applies to that type only. All memory installed in the compute module must be the
same type.
The compute module supports the following DIMM speeds:
• Single- and dual-rank PC4-2400 (DDR4-2400) RDIMMs operating at up to 2400 MT/s
• Dual- and quad-rank PC4-2400 (DDR4-2400) LRDIMMs operating at up to 2400 MT/s
Speed and capacity
DIMM type
DIMM rank
DIMM capacity (GB)
Native speed (MT/s)
RDIMM
Single
8
2400
RDIMM
Single
16
2400
RDIMM
Dual
16
2400
RDIMM
Dual
32
2400
LRDIMM
Dual
32
2400
LRDIMM
Quad
64
2400
LRDIMM
Octal
128
2400
Depending on the processor model, the number of DIMMs installed, and whether LRDIMMs or RDIMMs are
installed, the memory clock speed can reduce to 1600 MT/s.
Populated DIMM speed (MT/s)
DIMM type
DIMM rank
1 DIMM per
channel
2 DIMMs per
channel
3 DIMMs per
channel
RDIMM
Single (8 GB)
2400
2133
1866
RDIMM
Single (16 GB)
2400
2133
1866
RDIMM
Dual (16 GB)
2400
2400
1600
RDIMM
Dual (32 GB)
2400
2400
1600
LRDIMM
Dual (32 GB)
2400
2400
2133
LRDIMM
Quad (64 GB)
2400
2400
2133
LRDIMM
Octal (128 GB)
2400
2400
2133
SmartMemory
SmartMemory authenticates and unlocks certain features available only on Qualified memory and verifies
whether installed memory has passed Hewlett Packard Enterprise qualification and test processes. Qualified
memory is performance-tuned for ProLiant and BladeSystem servers and compute module, and provides
future enhanced support through Active Health and manageability software.
Memory subsystem architecture
The memory subsystem in this compute module is divided into channels. Each processor supports four
channels, and each channel supports three DIMM slots.
SmartMemory
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