Dimm Speed; Memory Configurations; Memory Population Guidelines; Table 9. Dimms Supported - Dell PowerEdge R730 Technical Manual

DIMM

DIMM speed

capacity
4 2133
8 2133
16 2133
32 2133
Only
DIMM speed
The R730/R730xd support memory speeds of 2133MT/s, 1600MT/s, 1333MT/s, 1066MT/s and
800MT/s, depending on the DIMM types installed and the configuration. All memory on all
processors and channels run at the same speed and voltage. By default, the systems run at the
highest speed for the channel with the lowest DIMM voltage and speed. The operating speed of the
DIMM is also determined by the maximum speed supported by the processor, the speed settings in
the BIOS, and the operating voltage of the system. Not all processors support 2133MT/s memory
speed.
Table 10.
DIMM DIMM
type ranking
RDIMM 1R and 2R
LRDIMM 4R

Memory configurations

The R730/R730xd support flexible memory configurations ranging from capacities of 4GB to 768GB.
The system supports up to 12 DIMMs per processor (up to 24 DIMMs in a dual-processor
configuration). The R730/R730xd have four memory channels per processor, with each channel
supporting up to three DIMMs.
Both systems support a flexible memory configuration, according to these basic rules:

Speed: If DIMMs of different speeds are mixed, all channels across all processors operate at the
slowest DIMM's common frequency.

DIMM type: Only one type of DIMM is allowed per system, either RDIMM or LRDIMM.

Memory population guidelines

The following memory population guidelines apply to the R730 and R730xd:

Can mix DIMMs with x4 and x8 data widths

Can mix DIMMs with different capacities
Population rules require the largest capacity DIMM be placed first
—
Maximum of two different capacity DIMMs allowed in a system
—

Can mix DIMMs with different ranks; maximum of two different rank DIMMs allowed in a system
PowerEdge R730 and R730xd Technical Guide
25
Table 9. DIMMs supported
DIMM Ranks per
type DIMM
RDIMM 1
RDIMM 2
RDIMM 2
LRDIMM 4
Memory configuration and performance
DIMM rated voltage,
Capacity
speed
4GB, 8GB, 16GB DDR4 (1.2V), 2133MT/s
32GB DDR4 (1.2V), 2133MT/s
Data
SDDC support
width
x8 Advanced ECC
x8 Advanced ECC
x4 All modes
x4 All modes
1 DPC 2 DPC
2133MT/s 2133MT/s
2133MT/s 2133MT/s
Voltage
1.2
1.2
1.2
1.2
3 DPC
1866MT/s
1866MT/s