Dell PowerEdge R520 Техническое руководство - Страница 19
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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
DIMM 0
type
UDIMM
RDIMM
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
Dense configuration
optimized profile
Memory demand and
patrol scrubbing
Number
DIMM 1
of
DIMMs
SR
1
DR
1
SR
SR
2
SR
DR
2
DR
DR
2
SR
1
DR
1
QR
1
SR
SR
2
SR
DR
2
DR
DR
2
QR
SR
2
QR
DR
2
QR
QR
2
Description
Increased memory reliability can be a result from this selectable platform profile
that adjusts parameters to reduce faults regarding refresh rates, speed,
temperature and voltage
Demand scrubbing is the ability to write corrected data back to the memory once
a correctable error is detected on a read transaction.
Patrol scrubbing proactively searches the system memory, repairing correctable
errors.
Speed (MT/s)
800
1066
1333
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
∞
1600
∞
∞
∞
∞