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https://www.dell.com/community/PowerEdge-Hardware-General/Single-Ranked-versus-Dual-Ranked-Memory-DIMMS/td-p/1288235
If only one memory module is installed, it must be installed in socket DIMM1_A. ... (4 total ranks) will give you better performance than 2 2GB single rank DIMMs (2 total ranks). The chipset will support up to 8 total ranks . Think of it like spindles in RAID. However, dual ranked DIMMs are less expensive, so your choice is either best ...
https://techlibrary.hpe.com/docs/iss/DL380pGen8/setup_install/advanced/Content/138678.htm
A single-rank DIMM has one set of memory chips that is accessed while writing to or reading from the memory. A dual-rank DIMM is similar to having two single-rank DIMMs on the same module, with only one rank accessible at a time. A quad-rank DIMM is, effectively, two dual-rank DIMMs on the same module. Only one rank is accessible at a time.
https://www.dell.com/community/PowerEdge-Hardware-General/Single-Rank-DIMMs-PowerEdge-2850/m-p/3358780/highlight/true
bhamill, This system only supports 4 dual ranked Dimms - and if you do put 4 of these dimms into slots 1A/B and 2A/B then you cannot populate slots 3A/B. Slots 3A/B will not accept dual rank dimms. You can have 2 dual ranked dimms and 4 single rank dimms. M@l
https://www.experts-exchange.com/questions/22966281/DIMM-3A-and-B-only-support-single-rank-memory.html
I'm trying to upgrade a Dell 2850 GII from 8 to 12GB RAM. The MoBo allows up to 16GB and currently has 4-2GB sticks of PC2-3200R in slots 1 A&B and 2 A&B. When I insert two more of the same memory, I get the message that slots 3 A&B only support single rank DIMMs, and I should remove the dual rank DIMMs.
https://support.hpe.com/hpsc/doc/public/display?docId=c02037017
A single-rank DIMM has one set of memory chips that is accessed while writing to or reading from the memory. A dual-rank DIMM is similar to having two single-rank DIMMs on the same module, with only one rank accessible at a time. A quad-rank DIMM is, effectively, two dual-rank DIMMs on the same module. Only one rank is accessible at a time.
https://en.wikipedia.org/wiki/Memory_rank
The term rank was created and defined by JEDEC, the memory industry standards group. On a DDR, DDR2, or DDR3 memory module, each rank has a 64-bit-wide data bus (72 bits wide on DIMMs that support ECC). The number of physical DRAMs depends on their individual widths.
https://www.neowin.net/forum/topic/1376882-can-i-use-single-ranked-ram-in-one-channel-and-a-dual-ranked-ram-in-a-separate-channel/page/2/
Nov 26, 2018 · If the DIMM PCB has memory chips only a single side it is a Single Rank or Single Side or SS. ... but that double rank DIMMs were OK for the first two slots. ... support cohabitation of single ...
https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/Memory-dual-rank-vs-single-rank/td-p/3698242
That applies only to quad rank or higher -- single and dual rank usually have the same timings -- and thus isn't relevant to laptops. ... Dual-rank DIMMs offer better interleaving and hence better performance than single-rank DIMMs." ... Memory: dual rank vs single rank 12-06-2018 07:56 AM.
https://www.reddit.com/r/techsupport/comments/bzvslc/laptop_ram_dual_channel_vs_dual_rank/
The dual channel basically means it can talk to both DIMMs, at the same time, at full speed. Using only single channel effectively halves your potential bandwidth because only 1 interconnect is active and it can only talk to 1 DIMM. "Rank" refers to how the memory chips on the stick are addressed by …
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