Specifications

The R520 supports memory speeds of 1600 MT/s, 1333 MT/s, 1066 MT/s, and 800 MT/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 R520 based on the population of
the number and type of DIMMs per memory channel.
DIMM
type
DIMM 0
DIMM 1
Number
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
∞
Reliability, availability, serviceability (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 10 describes the RAS
features supported on the R520.
Feature
Description
Dense configuration
optimized profile
Increased memory reliability can be a result from this selectable platform profile
that adjusts parameters to reduce faults regarding refresh rates, speed,