18
5
System memory
•
The PowerEdge T640 supports two DIMMs or one DIMM per channel for quad-rank DIMMs. There are 24 sockets-288 pins in
total.
•
T640 supports RDIMM, LRDIMM and NVDIMM memory technologies at up to 2666 MHz-DDR4.
•
T640 does not support mixing of DIMM types other than RDIMMs and NVDIMMs. Either the platform is populated with
RDIMMs (with or without NVDIMMs) or LRDIMMs.
Table 6. Supported memory
Capacity Data width
DIMM max speed
Rated voltage
SDDC support
Ranks per DIMM
8
x8
2666 MHz
1.2
Advanced ECC
1
16
x8
2666 MHz
1.2
Advanced ECC
2
32
x4
2666 MHz
1.2
All modes
2
64
x4
2666 MHz
1.2
All modes
4
16
x4
2666 MHz
1.2
All modes
1
32
x4
2666 MHz
1.2
All modes
2
Memory speed
The PowerEdge T640 support memory speeds of 1866 MT/s, 2133 MT/s, 2400 MT/s, and 2666 MT/s depending on the DIMM
types installed and
configured.
All memory on all processors and channels run at the same speed and voltage. By default, highest
common supported speed between the CPUs and DIMMs. The operating speed of the memory is also determined by the maximum
speed supported by the processor, the speed settings in the BIOS, and the operating voltage of the system.
Table 7. DIMM performance details
RDIMM
• Maximum frequency of 2666 MT/s
•
Maximum frequency using 2 DIMMs per channel of 2666 MT/s
•
Maximum capacity of 32GB per DIMM
•
Maximum system capacity of 768GB
LRDIMM
• Maximum frequency of 2666 MT/s
•
Maximum frequency using 2 DIMMs per channel of 2666 MT/s
•
Maximum capacity of 64GB per DIMM
•
Maximum system capacity of 1.5TB
NOTE: 128GB LRDIMMs/Max capacity 3TB are available post-initial
release.
NVDIMM •
Maximum frequency of 2666 MT/s
•
Maximum frequency using 2 DIMMs per channel of 2666 MT/s
•
Maximum capacity of 16GB per DIMM
•
Maximum system capacity of 192GB (up to 12 DIMMs per system)
DIMM type
Description
