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Supported Memory
The PowerEdge R940 supports up to 48 DIMM slots, with up to 6 TB of memory and speeds up to 2666 MT/s. Supported DIMMs are
registered (RDIMMs) and load reduced (LRDIMMs) DIMMs which uses a buffer to reduce memory loading and provide greater density
allowing maximum memory capacity.
Memory speed
The PowerEdge R940 supports memory speeds of 2666 MT/s, 2400 MT/s, and 1866 MT/s depending on the DIMM types installed and
configured. All memory on all of the processors and channels run at the same speed and voltage. The operating speed of the memory is
determined by the maximum speed supported by the processor, the speed settings in BIOS, and the operating voltage of the system.
Table 6. Memory configuration based on quantity and quality of DIMM
DIMM type
DIMM ranking Capacity
DIMM rated voltage
and speed
Max speed (MT/s) on 1
DPC
Max speed (MT/s) on
2 DPC
RDIMM
1R/2R
8 GB, 16 GB, 32 GB
DDR4 (1.2 V), 2666
MT/s
2666
2666
LRDIMM
4R/8R
64 GB, 128 GB
DDR4 (1.2 V), 2666
MT/s
2666
2666
Memory configurations and population rules
The R940 supports flexible memory configurations ranging from 8 GB (minimum) to 128 GB (maximum). The R940 supports up to 12
DIMMs per processor or 24 DIMMs in a dual-processor and 48 DIMMs in a quad-processor configuration. Each R940 has 6 memory
channels per processor, with each channel supporting up to 2 DIMMs.
The R940 server support flexible memory configuration according to the following population rules:
•
If DIMMs of different speeds are mixed, all channels across all processors operate at the slowest DIMM's common frequency.
•
DIMM type:
•
All DIMMs must be DDR4 RDIMM and LRDIMM
•
Only one type of DIMM is allowed per system-RDIMM, or LRDIMM. They cannot be mixed.
•
DIMMs with different data width (x4 and x8 data width) can be mixed.
•
The largest DIMM capacity is placed first (slot A1 first, then A2 and so on). The second CPU mirrors the first CPU population rule.
•
Maximum of two different capacity DIMMs are allowed in the system.
•
Maximum of two different rank DIMMs are allowed in the system.
Table 7. DIMM mixing support
DIMM types
RDIMM
LRDIMM
3DS LRDIMM
RDIMM
allowed
not allowed
not allowed
LRDIMM
not allowed
allowed
not allowed
3DS LRDIMM
not allowed
not allowed
allowed
5
Supported Memory
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