Dell PowerEdge R720 Technical Guide - Page 23

Dimm 0, Dimm 1, Dimm 2, Dimms, Speed Mt/s - poweredge r720xd memory installation

Page 23 highlights

Memory speeds of 1600 MT/s, 1333 MT/s, 1066 MT/s, and 800 MT/s are supported on the R720 and R720xd, 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. DIMM type UDIMM RDIMM DIMM 0 SR DR SR SR DR SR DR QR SR SR DR QR QR QR SR SR SR DR QR QR QR DIMM 1 SR DR DR SR DR DR SR DR QR SR SR DR DR QR QR DIMM 2 SR DR DR DR QR # of DIMMs 800 1 ∞ 1 ∞ 2 ∞ 2 ∞ 2 ∞ 1 ∞ 1 ∞ 1 ∞ 2 ∞ 2 ∞ 2 ∞ 2 ∞ 2 ∞ 2 ∞ 3 ∞ 3 ∞ 3 ∞ 3 ∞ 1 2 3 Speed (MT/s) 1066 1333 ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ 1600 23 PowerEdge R720 and R720xd Technical Guide

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23
PowerEdge R720 and R720xd Technical Guide
Memory speeds of 1600 MT/s, 1333 MT/s, 1066 MT/s, and 800 MT/s are supported on the R720 and
R720xd, 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.
DIMM
type
DIMM 0
DIMM 1
DIMM 2
# of
DIMMs
Speed (MT/s)
800
1066
1333
1600
UDIMM
SR
1
DR
1
SR
SR
2
SR
DR
2
DR
DR
2
RDIMM
SR
1
DR
1
QR
1
SR
SR
2
SR
DR
2
DR
DR
2
QR
SR
2
QR
DR
2
QR
QR
2
SR
SR
SR
3
SR
SR
DR
3
SR
DR
DR
3
DR
DR
DR
3
QR
1
QR
QR
2
QR
QR
QR
3