Memory Speed; Memory Ras Features; Table 8. Memory Speed Capabilities - Dell PowerEdge M820 Technical Manual

Memory speed

The M820 server 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 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
DIMM 0
type
SR
DR
QR
SR
SR
DR
RDIMM QR
QR
QR
SR
SR
SR
DR
QR
LRDIMM QR
QR
*Although the M820 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/PowerEdge.

Memory RAS features

RAS features help keep the system online and operational without significant impact to performance,
and can decrease data loss and crashing due to errors. RAS aids in rapid, accurate diagnosis of faults
that require service. Table 9 describes the memory RAS features supported on the M820.
PowerEdge M820 Technical Guide
19
Table 8. Memory speed capabilities
Number
DIMM 1 DIMM 2
DIMMs
SR
DR
DR
SR
DR
QR
SR SR
SR DR
DR DR
DR DR
QR
QR QR
Speed (MT/s)
of
800* 1066*
1 ∞ ∞
1 ∞ ∞
1 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞ ∞
3 ∞ ∞
3 ∞ ∞
3 ∞ ∞
3 ∞ ∞
1 ∞
2 ∞
3 ∞
1333 1600
∞ ∞
∞ ∞
∞
∞ ∞
∞ ∞
∞ ∞
∞
∞
∞
∞
∞
∞
∞