Dell PowerEdge M620 Technical Manual - Page 21

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DIMM

type

LRDIMM

*Although the M620 supports DIMM speeds of 800MT/s and 1066MT/s, you can only purchase this system with DIMM

speeds of 1333MT/s, 1600MT/s and 1866MT/s on Dell.com/PowerEdge.

Memory RAS features

Reliability, availability and serviceability 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 which require service. Table 9 describes the memory RAS

features supported on the M620.

Feature

Dense configuration

optimized profile

Memory demand and

patrol scrubbing

Recovery from single

DRAM device failure

(SDDC)

Failed DIMM isolation

Memory mirroring:

intra-socket

Memory address parity

protection

PowerEdge M620 Technical Guide

DIMM

Number

of DIMMs

Table 9.

Memory RAS features

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.

Recovery from Single DRAM Device Failure (SDDC) provides error checking and

correction that protects against any single memory chip failure as well as multi-bit

errors from any portion of a single memory chip.

This feature provides the ability to identify a specific failing DIMM channel pair,

thereby enabling the user to replace only the failed DIMM pair.

Memory mirroring is a method of keeping a duplicate (secondary or mirrored)

copy of the contents of memory as a redundant backup for use if the primary

memory fails. The mirrored copy of the memory is stored in memory of the same

processor socket.

This feature provides the ability to detect transient errors on the address lines of

the DDR channel.

800*

1066*

∞

Speed (MT/s)

1333

1600

∞

1866

∞