Specifications

19 PowerEdge M820 Technical Guide
Memory speeds of 1600MT/s, 1333MT/s, 1066MT/s, and 800MT/s are supported on the M820,
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 system runs 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 8 lists the memory configuration and performance details for the M820, based on the
population of the number and type of DIMMs per memory channel.
DIMM
type
DIMM 0
DIMM 1
DIMM 2
Number
of
DIMMs
Speed (MT/s)
800
1066
1333
1600
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
∞