Dell PowerEdge M620 Technical Manual

Also see for PowerEdge M620: Command reference guide Glossary Owner's manual Administrator's guide Hardware reference manual

Contents

Dell PowerEdge M620 Technical Manual Manual pdf 20 page image

20 PowerEdge M620 Technical GuideFlexible memory configurationThe M620 supports a flexible memory configuration according to the following basic rules: Speed: If DIMMs of different speeds are mixed, all channels across all processors operate at theslowest DIMM’s common frequency. DIMM type: Only one type of DIMM is allowed per system: UDIMM, RDIMM or LRDIMM. Thesetypes cannot be mixed.The following additional memory population guidelines apply to the M620: Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs maybe populated per channel. Although an LRDIMM is physically a QR DIMM, logic on the LRDIMMcan make it appear as a DR DIMM to the system, allowing up to three LDRIMMs per channel. DIMMs must be installed in each channel, starting with the DIMM farthest from the processor. DIMMs should be installed with largest rank count to smallest. For example, if DR DIMMS aremixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SRDIMMs.For more information on memory configuration and population, see theDell PowerEdge M620Systems Owner’s Manual on Dell.com/Support/Manuals.Memory speedThe M620 supports memory speeds of 1866MT/s, 1600MT/s, 1333MT/s, 1066MT/s, and 800MT/sdepending on the DIMM types installed and the configuration. All memory on all processors andchannels run at the same speed and voltage. By default, the system runs at the highest speed for thechannel with the lowest DIMM voltage and speed. The operating speed of the memory is alsodetermined by the maximum speed supported by the processor, the speed settings in the BIOS, andthe operating voltage of the system.Table 8 lists the memory configuration and performance details for the M620, based on thepopulation of the number and type of DIMMs per memory channel.Table 8. Memory speed capabilitiesDIMMtypeDIMM0DIMM1DIMM2Numberof DIMMsSpeed (MT/s)800* 1066* 1333 1600 1866UDIMMSR 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 ∞ ∞