Single rank Memory deserve to be memory with chips on only one next of the memory module (stick the memory) or chips on both sides of the module as lengthy as the chips room in one rank that is accessed while writing to or reading from the memory. Double Rank memory is basically like having actually two solitary Rank chip ranking on one memory module, with only one rank accessible at a time. Quad Rank memory is, effectively, two dual Rank Chip set on one memory module, with only one rank available at a time. Twin and Quad location DIMMs administer the greatest capacity v the existing memory technology. For example, if existing DRAM modern technology supports 1GB solitary Rank DIMMs, dual Rank DIMM would be 8GB, and a Quad rank DIMM would certainly be 16GB.

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Memory location is differentiated by the details that is displayed on the details sticker top top the memory, solitary Rank has actually a 1Rx ~ above it, for instance 1Rx8/1Rx8/1Rx16, on the upper and lower reversal side dual Rank Memory has a 2Rx on it, for instance 2Rx8/2Rx8/2Rx16 and Quad Rank has actually a 4Rx top top it, for example 4Rx8/4Rx8/4Rx16. (See below for Examples)

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Overview Generally single Rank storage is much faster than dual Rank Memory, in layman’s terms as soon as a computer system accesses solitary Rank memory it only has to go approximately the track once, wherein are dual Rank the would need to go approximately the monitor twice.

However details systems have better performance with multi rank memory as result of onboard memory controllers. This is specifically true because that LRDIMM server memory.

Compatibility For the most part dual Rank Memory have the right to be supplied in conjunction with single Rank Memory, and in some cases when using a big amount of storage such together 16GB, servers motherboards actually call for you to usage a mix of single and double Rank Memory.

Ranking The variety of ranks on any type of DIMM is the variety of independent set of DRAMs that can be accessed because that the full data bit‐width that the DIMM in other words 64 bits. The ranking cannot be accessed concurrently as lock share the very same datapath. The physics layout of the theatre chips top top the DIMM itself does not necessarily relate to the number of ranks. Sometimes the layout of every DRAM top top one side of the DIMM PCB matches both political parties is described as “single‐sided” versus “double‐sided”. This terms may reason confusion as they carry out not necessarily relate to exactly how the DIMMs space logically organized or accessed.

For example, on a solitary rank DIMM that has 64 data bits the I/O pins, there is just one collection of DRAMs that room turned top top to journey a review or receive a create on every 64‐bits. In most digital systems, storage controllers room designed to accessibility the full data bus broad of the memory module in ~ the exact same time.

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On a64‐bit (non‐ECC) DIMM made with two ranks, there would certainly be 2 sets of dram that could be accessed at different times. Only one of the ranks have the right to be accessed in ~ a time, due to the fact that the plays data bits room tied with each other for two tons on the DIMM (Wired OR). Ranks room accessed v chip selects (CS). For this reason for a 2 rank module, the 2 DRAMs through data bits bound together might be accessed by a CS per DRAM (e.g. CS0 goes to one theatre chip and also CS1 goes to the other). DIMMs are currently being generally manufactured with up to four ranks every module.

Consumer DIMM vendors have recently begun to distinguish between single and double ranked DIMMs. JEDEC decided that the state “dual‐sided,” “double‐sided,” or “dual‐banked” were not correct when applied to registered DIMMs. (from Wikipedia)