19 PowerEdge R420 Technical Guide
Memory speed
The R420 supports 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 memory configuration and performance details for the R420 based on the population
of the number and type of DIMMs per memory channel.
Table 9. Memory speed capabilities
DIMM
type
DIMM 0 DIMM 1
Number
of
DIMMs
Speed (MT/s)
800* 1066* 1333 1600
UDIMM
SR
1 ∞ ∞ ∞ ∞
SR SR 2 ∞ ∞ ∞ ∞
DR DR 2 ∞ ∞ ∞ ∞
RDIMM
QR SR 2 ∞ ∞
QR QR 2 ∞ ∞
*Although the R420 supports DIMM speeds of 800MT/s and 1066MT/s, you can only purchase this system
with DIMM speeds of 1333MT/s and 1600MT/s on Dell.com.
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