Dell PowerEdge T420 Technical Manual

Also see for PowerEdge T410: Manual Installation Update Technical guide Update

Contents

Dell PowerEdge T420 Technical Manual Manual pdf 21 page image

21 PowerEdge T420 Technical Guidethe same speed and voltage. By default, the systems run at the highest speed for the channel withthe lowest DIMM voltage and speed. The operating speed of the memory is also determined by themaximum speed supported by the processor, the speed settings in the BIOS, and the operatingvoltage of the system.Table 10 lists memory configuration and performance details for the T420 based on the populationof the number and type of DIMMs per memory channel.Table 10. Memory speed capabilitiesDIMMtype DIMM 0 DIMM 1NumberofDIMMsSpeed (MT/s)800* 1066* 1333 1600UDIMMSR 1 ∞ ∞ ∞ ∞DR 1 ∞ ∞ ∞ ∞SR SR 2 ∞ ∞ ∞ ∞SR DR 2 ∞ ∞ ∞ ∞DR DR 2 ∞ ∞ ∞ ∞RDIMMSR 1 ∞ ∞ ∞ ∞DR 1 ∞ ∞ ∞ ∞QR 1 ∞ ∞ ∞SR SR 2 ∞ ∞ ∞ ∞SR DR 2 ∞ ∞ ∞ ∞DR DR 2 ∞ ∞ ∞ ∞QR SR 2 ∞ ∞QR DR 2 ∞ ∞QR QR 2 ∞ ∞*Although the T420 supports DIMM speeds of 800MT/s and 1066MT/s, you can only purchase this system withDIMM speeds of 1333MT/s and 1600MT/s on Dell.com/PowerEdge.Memory RAS featuresRAS 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 faultsthat require service. Table 11 describes the RAS features supported on the T420.Table 11. Memory RAS featuresFeature DescriptionDense configurationoptimized profileIncreased memory reliability can result from this selectable platform profile, whichadjusts parameters to reduce faults regarding refresh rates, speed, temperature,and voltage.Memory demand andpatrol scrubbingDemand scrubbing is the ability to write corrected data back to the memory oncea correctable error is detected on a read transaction.Patrol scrubbing proactively searches the system memory, repairing correctableerrors.