Specifications

22 PowerEdge T420 Technical Guide
 White boxes (with lower voltage) can save power but will run at slower speeds
 White boxes (with higher voltage) can be custom configured in the bios
Table 10. Memory speed capabilities
DIMM
type
DIMM
rank
DIMM-rated voltage
and speed
Intel Xeon processor E5-2400
and E5-2400 v2 product
families
DIMMs per channel (DPC)
1 DPC
2 DPC
1.35V
1.5V
1.35V
1.5V
RDIMM
1R/2R
DDR3L (1.5V)
1600MT/s
1600
1600
1600
1600
RDIMM
1R/2R
DDR3L (1.35V/1.5V)
1333 MT/s
1333
1333
1333
1333
UDIMM
1R/2R
DDR3L (1.35V/1.5V)
1600
1600
1600
1600
1600
RDIMM
4R
DDR3L (1.35V/1.5V)
1333MT/s
1066
1333
1066
1066
LRDIMM
4R
DDR3L (1.35V/1.5V)
1333MT/s
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 11 describes the RAS features supported on the T420.
Table 11. Memory RAS features
Feature
Description
Dense configuration
optimized profile
Increased memory reliability can result from this selectable platform profile, which
adjusts parameters to reduce faults regarding refresh rates, speed, temperature,
and voltage.
Memory demand and
patrol scrubbing
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
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.
Failed DIMM isolation
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:
intra-socket
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.