Hardware
Server memory
Types, population rules, diagnostics and upgrades for Dell, Lenovo and Supermicro servers.
Memory is the cheapest upgrade with the biggest effect on a slow server, and the easiest to get wrong. These pages cover each module type, the rules for populating a server without losing bandwidth, and how we diagnose errors before replacing anything.
Topics
DDR5 RDIMMDDR5 registered DIMMs for 16G Dell PowerEdge, Lenovo ThinkSystem V3 and Supermicro X13/H13 servers: speeds, capacities, population rules and...DDR4 RDIMMDDR4 registered ECC memory for 13G to 15G Dell PowerEdge, Lenovo ThinkSystem V1/V2, System x M5 and Supermicro X10 to X12 servers. Upgrades,...DDR3 RDIMMDDR3 registered ECC memory for legacy Dell PowerEdge 11G/12G, IBM System x M4 and older Supermicro servers still in service. Sourcing, testi...LRDIMM (load-reduced DIMM)Load-reduced DIMMs for high-capacity server memory: when to use LRDIMMs instead of RDIMMs, mixing rules and platforms that support them.ECC UDIMM (unbuffered)Unbuffered ECC memory for single-socket entry servers: Dell PowerEdge T150/T350/R250/R350, Lenovo ST50/ST250 and Supermicro Xeon E servers.NVDIMM and Intel Optane Persistent MemoryPersistent memory on Dell PowerEdge and Lenovo ThinkSystem: NVDIMM-N, Intel Optane PMem 100/200 series, App Direct vs Memory Mode, and what ...Memory speed, ranks and population rulesHow DIMM speed, rank count and slots-per-channel determine real server memory performance on Dell, Lenovo and Supermicro platforms, and how ...Server memory errors and diagnosticsDiagnosing correctable and uncorrectable memory errors on Dell PowerEdge (iDRAC, LCL), Lenovo ThinkSystem (XClarity) and Supermicro (IPMI): ...SO-DIMM memory for edge and micro serversSmall-outline DIMMs in edge servers, NUC-class systems, Supermicro E100/E300 and network appliances: ECC vs non-ECC and capacity limits.Server memory upgrade serviceRackLedge sizes, sources, installs and validates server memory upgrades on Dell PowerEdge, Lenovo ThinkSystem, Supermicro and HPE ProLiant, ...
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