22 PowerEdge R630 Technical Guide
DIMM speed
The R630 supports 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 9. Memory configuration and performance
DIMM rated voltage,
speed
Memory configurations
The R630 server supports 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 R630 has four memory channels per processor, with each channel supporting
up to three DIMMs.
The R630 supports 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 R630:
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
Table 10. Memory populations and operating frequencies
DIMM populated
per channel
Operating frequency (MT/s)
Maximum DIMM ranks
per channel
For more information on memory configuration, see the
Dell PowerEdge R630 Owner’s Manual
on
Dell.com/Support/Manuals.
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