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#REDIRECT [[DIMM#SO-DIMM]]
{{More references|date=August 2014}}


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[[File:1GB DDR2 SO-DIMM.png|thumb|A 200-pin [[PC2-6400]] DDR2 SO-DIMM]]
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[[File:4GB DDR3 SO-DIMM.jpg|thumb|A 204-pin PC3-10600 DDR3 SO-DIMM]]
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[[File:Laptop SODIMM DDR Memory Comparison V2.svg|thumb|right|A comparison between 200-pin DDR and DDR2 SDRAM SO-DIMMs, and a 204-pin DDR3 DIMM module<ref name="custhelp" />]]
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[[File:DDR SO-DIMM slot PNr°0341.jpg|thumb|300px|A SO-DIMM slot on a computer [[motherboard]]]]
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A '''SO-DIMM''', '''SODIMM''', or '''small outline dual in-line memory module''', is a type of [[computer memory]] built using [[integrated circuits]]. SO-DIMMs are a smaller alternative to a [[DIMM]], being roughly half the size of regular DIMMs.

SO-DIMMs are often used in systems that have limited space, which include [[Laptop|notebook]]s, small-footprint [[personal computer]]s such as those based on [[Mini-ITX]] [[motherboard]]s, high-end upgradable office [[Computer printer|printers]], and [[networking hardware]] such as [[router (computing)|router]]s and [[Network-attached storage|NAS]] devices.<ref>{{cite web|url=https://www.synology.com/en-global/products/Synology_RAM_Module|title=Synology RAM Module|author=Synology Inc.|work=synology.com}}</ref>

== Visual identification ==
Most types of SO-DIMMs can be recognized at a glance by the distinctive notches that “key” them for different applications:<ref name="custhelp">{{cite web
| url = http://acer.custhelp.com/app/answers/detail/a_id/2178/~/are-ddr,-ddr2-and-ddr3-so-dimm-memory-modules-interchangeable%3F
| title = Are DDR, DDR2 and DDR3 SO-DIMM memory modules interchangeable?
| accessdate = 2015-06-26
| website = acer.custhelp.com
}}</ref>
* 100-pin SO-DIMMs have two notches.<ref>{{cite web
| url = http://www.memorytesters.com/ramcheck/ddr_100pin_adap.htm
| title = RAMCHECK 100-Pin DDR Adapter, a tool for testing and identifying JEDEC-compliant 100-pin DDR SO-DIMM modules
| year = 2013 | accessdate = 2015-06-26
| website = memorytesters.com
}}</ref>
* 144-pin SO-DIMMs have a single notch near the center.<ref>{{cite web
| url = http://www.micron.com/~/media/documents/products/data-sheet/modules/sodimm/sdf16c32_64x64hg.pdf
| title = Small-outline SDRAM module (MT16LSDF3264(L)H 256&nbsp;MB and MT16LSDF6464(L)H 512&nbsp;MB) Datasheet
| date = 2006-05-03 | accessdate = 2015-06-26
| publisher = [[Micron Technology]] | format = PDF
| page = 22
}}</ref>
* 200-pin SO-DIMMs have a single notch nearer to one side.<ref>{{cite web
| url = http://www.smartm.com/files/salesLiterature/dram/ddr.pdf#page=4
| title = DDR DIMM&nbsp;& SODIMM Modules (184-pin DDR DIMM, 100-pin DDR DIMM, and 200-pin DDR SO-DIMM modules)
| year = 2011 | accessdate = 2015-06-26
| website = smartm.com | format = PDF
| page = 4
}}</ref> The exact location of this notch varies (read below).
* 214-pin SO-DIMMs ([[DDR3]]) have a single notch closer to the center than on 200-pin SO-DIMMs.<ref>{{cite web
| url = http://www.nanya.com/NanyaAdmin/GetFiles.ashx?ID=1118
| title = NT2GC64B(C)H4B0PS / NT4GC64B(C)88B0(1)NS / NT8GC64B(C)8HB0NS PC3(L)-10600 / PC3(L)-12800 Unbuffered DDR3 SO-DIMM
| date = December 2012 | accessdate = 2015-06-26
| website = nanya.com | format = PDF
| page = 23
}}</ref>
* 260-pin SO-DIMMs ([[DDR4]]), {{convert|69.6|mm|in|abbr=in}} wide and {{convert|30|mm|in|abbr=in}} high, making them {{convert|2|mm|in|abbr=in}} wider than DDR3 SO-DIMMs, with a single notch after pin 144.<ref>{{cite web
| url = http://www.micron.com/-/media/documents/products/data%20sheet/modules/sodimm/ddr4/asf18c1gx72hz.pdf
| archiveurl = https://web.archive.org/web/20141129035318/http://www.micron.com/-/media/documents/products/data%20sheet/modules/sodimm/ddr4/asf18c1gx72hz.pdf
| title = DDR4 SDRAM SO-DIMM (MTA18ASF1G72HZ, 8&nbsp;GB) Datasheet
| date = 2014-09-10 | accessdate = 2015-06-26 | archivedate = 2014-11-29
| publisher = [[Micron Technology]] | format = PDF
| page = 18
}}</ref>
* 260-pin SO-DIMMs ([[UniDIMM]]), {{convert|69.6|mm|in|abbr=in}} wide and {{convert|30|mm|in|abbr=in}} or {{convert|20|mm|in|abbr=in}} high, with a single notch placed differently than on DDR3 SO-DIMMs.<ref>{{cite web
| url = https://intel.activeevents.com/sf14/connect/fileDownload/session/088B5032E176191914DF467EAE7171BB/SF14_SPCS009_102f.pdf
| title = DDR4: The Right Memory for Your Next Server and High-End Desktop System
| date = 2014-09-16 | accessdate = 2015-06-26
| author1 = Geof Findley | author2 = Becky Loop
| publisher = [[Intel]] | website = intel.activeevents.com
| format = PDF | page = 28
}}</ref><ref>{{cite web
| url = http://www.techpowerup.com/205231/how-intel-plans-to-transition-between-ddr3-and-ddr4-for-the-mainstream.html
| title = How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream
| date = 2014-09-14 | accessdate = 2015-06-26
| website = techpowerup.com
}}</ref>

=== Variants of 200-pin SO-DIMMs ===
The 200-pin SO-DIMM can be of the types DDR and DDR2. In both cases the notch is located at one fifth of the board length (20 pins + notch + 80 pins), but in DDR2 the notch is located slightly closer to the center of the board. These two types of memory are not interchangeable. The different notch locations are designed to prevent cross-installation, aiding at the same time in visually identifying 200-pin SO-DIMM modules.<ref name="custhelp" />

This variance is designed to prevent coupling of memory and controllers of different DDR generations due to electrical incompatibility. DDR SO-DIMMs operate at 2.5&nbsp;V while DDR2 SO-DIMMs operate at 1.8&nbsp;V.<ref>{{cite web
| url = http://www.integralmemory.com/faq/can-i-mix-ddr-ddr2-and-ddr3-modules-my-pc
| title = DRAM – Can I mix DDR, DDR2 and DDR3 modules-my PC?
| accessdate = 2015-06-26
| website = integralmemory.com
}}</ref>

=== Variants of DDR3 SO-DIMMs ===
These modules, while using the same physical layout, may differ in the specified voltage - 1.5 or 1.35 volts. The lower voltage modules are sometimes, but not always, identified as '''DDR3L''' - see also [[DDR3_SDRAM#DDR3L_and_DDR3U_extensions]]. Low voltage modules are compatible with high voltage mainboards, but not vice versa. There are some exceptions that rule however (see reviews at https://www.newegg.com/global/fr/Product/Product.aspx?Item=N82E16820231692)

== {{Anchor|SO-CDIMM}}General characteristics ==
200- and 204-pin SO-DIMMs are {{Convert|67.6|mm|in|abbr=in}} long and {{Convert|31.75|mm|in|abbr=in}} wide, with a maximum total depth of {{Convert|3.8|mm|in|abbr=in}}.<ref>[http://download.micron.com/pdf/toolbox/SODIMMDesignStand_rev1.pdf micron.com - 200 Pin, PC2700 DDR SDRAM Unbuffered SO–DIMM REFERENCE DESIGN SPECIFICATION] page 26</ref>

SO-DIMMs are more or less equal in power and voltage rating to DIMMs, and despite the smaller size of memory modules, SO-DIMM technology does not mandate lower performance compared to larger DIMMs. For example, DDR3 SO-DIMMs provide clock speeds such as 533&nbsp;MHz (1066&nbsp;MT/s, [[DDR3 SDRAM#JEDEC standard modules|PC3-8500]]), [[CAS latency|CAS latencies]] such as 7, and higher capacities such as 4&nbsp;GB per module.<ref>{{cite web|url=http://www.corsair.com/en/cm3x4gsd1066|title=Corsair Memory — 4GB DDR3 SODIMM Memory (CM3X4GSD1066)|work=corsair.com|accessdate=1 October 2015}}</ref>

DDR2 SO-DIMM memory modules commonly have clock speeds from 200&nbsp;MHz up to 400&nbsp;MHz ([[DDR2 SDRAM#Specification standards|PC2-6400]]).{{Citation needed|date=December 2010}} 204-pin SO-DIMMs can also contain DDR3 SDRAM, with specifications such as PC3-6400, PC3-8500, PC3-10600, PC3-14900 and PC3-17000.<ref>{{cite web|url=https://www.jedec.org/standards-documents/docs/module-42018|title=204-Pin DDR3 SDRAM Unbuffered SODIMM Design Specification|publisher=}}</ref> 260-pin [[UniDIMM]]s may contain either DDR3 or DDR4 SDRAM, depending on their configuration. Some SO-DIMMs also provide [[ECC memory|ECC]] functionality; [[Unbuffered memory|unbuffered]] ECC SO-DIMMs are called ''SO-CDIMMs''.<ref>{{cite web|url=http://www.rampedia.com/index.php/define-so-cdimm |title=Define-SO-CDIMM |publisher=RAMpedia |date= |accessdate=2014-08-24}}</ref>

== See also ==
{{Portal|Electronics}}

{{Div col||25em}}
* [[Dual in-line package]] (DIP)
* [[Memory scrambling]]
* [[Memory geometry]]{{snd}} logical configuration of RAM modules (channels, ranks, banks, etc.)
* [[RDRAM|Rambus in-line memory module]] (RIMM)
* [[Single in-line memory module]] (SIMM)
* [[Single in-line package]] (SIP)
* [[Zig-zag in-line package]] (ZIP)
{{Div col end}}

== References ==
{{Reflist|30em}}

== External links ==
{{Commons category|SO-DIMM}}

* [http://www.memorydepot.com/guide_install.asp How to Install PC Memory Guides]
* [http://smallformfactors.opensystemsmedia.com/articles/ruggedizing-ram-industrial-systems/ Ruggedizing RAM for industrial systems] (XR-DIMM form factor)

{{DRAM}}

{{DEFAULTSORT:So-Dimm}}
[[Category:Computer memory form factor]]

Latest revision as of 21:43, 9 May 2022

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