
25 PowerEdge R720 and R720xd Technical Guide
The R720 and R720xd support memory speeds of 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 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 9 lists the memory configuration and performance details for the R720 and R720xd, based on
the population of the number and type of DIMMs per memory channel.
*Although the R720 and R720xd support DIMM speeds of 800MT/s and 1066MT/s, you can only purchase these systems
with DIMM speeds of 1333MT/s and 1600MT/s on Dell.com.
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