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  1. DDR4-2666 DDR4-2666 ECC Memory Type 2 Slots Number of SO-DIMM Slot Max 64GB Max Capacity: DDR4-2666 DDR4-2666 ECC Memory Type 2 Slots Number of SO-DIMM Slot Max 64GB Max Capacity: Storage Capability: 1x M.2 SSD slot (NVMe PCIe Gen3) 1x M.2 SSD Combo slot (NVMe PCIe Gen3 / SATA) 1x M.2 SSD slot (NVMe PCIe Gen3) 1x M.2 SSD Combo slot (NVMe PCIe.
  2. Plug this 8gb SO-DIMM ddr4 2400mhz in one of the 2 Ddr4 Dual-channel 64-bit So-dimm Sockets. In order to exploit the Dual-Channel mode make sure that you install memory modules of the same type and density in different channel DIMM slots.

Hi, I use HP Laptop 15-bs164tu.:Laptop: I want to expand my RAM. ( 4GB + 8GB = 12 GB ) I currently have ' 4GB DDR4-2666 / PC4-21300 DDR4 SDRAM SO-DIMM ' in one slot on 'HP 832A Motherboard.' I saw a cheap option 'Crucial 8GB DDR4-2400 SODIMM CT8G4SFS824A'. OWC 32GB (2 x 16GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade for 2017 iMac 27 inch with Retina 5K Display 4.7 out of 5 stars 227 TEAMGROUP Elite 16GB Kit (2 x 8GB) DDR4 2400MHz (PC4-19200) CL16 Unbuffered Non-ECC 1.2V SODIMM 260-Pin Laptop Notebook PC Computer Memory Module Ram Upgrade - TED416G2400C16DC-S01-16GB Kit (2 x 8GB.

A 200-pin PC2-5300 DDR2 SO-DIMM
A 204-pin PC3-10600 DDR3 SO-DIMM
A comparison between 200-pin DDR and DDR2 SDRAM SO-DIMMs, and a 204-pin DDR3 SO-DIMM module[1]
A SO-DIMM slot on a computer motherboard

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 laptops, notebooks, small-footprint personal computers such as those based on Mini-ITXmotherboards, high-end upgradable office printers, and networking hardware such as routers and NAS devices.[2]

Visual identification[edit]


Most types of SO-DIMMs can be recognized visually by the distinctive notches that 'key' them for different applications:[1]

  • 100-pin SO-DIMMs (SDR SDRAM) have two notches.[3]
  • 144-pin SO-DIMMs (SDR SDRAM) have a single notch near the center.[4]
  • 200-pin SO-DIMMs (DDR SDRAM or DDR2 SDRAM) have a single notch nearer to one side.[5] The exact location of this notch varies (read below).
  • 204-pin SO-DIMMs (DDR3 SDRAM) have a single notch closer to the center than on 200-pin SO-DIMMs.[6]
  • 260-pin SO-DIMMs (DDR4 SDRAM), 69.6 mm (2.74 inches) wide and 30 mm (1.2 inches) high, making them 2 mm (0.079 inches) wider than DDR3 SO-DIMMs, with a single notch after pin 144.[7]
  • 260-pin SO-DIMMs (UniDIMM), 69.6 mm (2.74 inches) wide and 30 mm (1.2 inches) or 20 mm (0.79 inches) high, with a single notch placed differently than on DDR3 SO-DIMMs.[8][9]

Variants of 200-pin SO-DIMMs[edit]

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.[1]

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 V while DDR2 SO-DIMMs operate at 1.8 V.[10]

Variants of DDR3 SO-DIMMs[edit]

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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.

General characteristics[edit]

200-pin and 204-pin SO-DIMMs are 67.6 mm (2.66 inches) long, 31.75 mm (1.250 inches) wide, having a maximum total depth of 3.8 mm (0.15 inches).[11]

SO-DIMMs are nearly equal in power and voltage rating to DIMMs; SO-DIMM technology does not mean lower performance compared to larger DIMMs. For example, DDR3 SO-DIMMs provide clock speeds such as 533 MHz (1066 MT/s, PC3-8500), CAS latencies such as 7, and higher capacities such as 4 GB per module.[12]

DDR2 SO-DIMM memory modules commonly have clock speeds from 200 MHz upward (specifications). 204-pin SO-DIMMs can also contain DDR3 SDRAM, with specifications such as PC3-6400, PC3-8500, PC3-10600, PC3-14900 and PC3-17000.[13] 260-pin UniDIMMs contain DDR3 or DDR4 SDRAM depending on configuration. Some SO-DIMMs provide ECC functionality; unbuffered ECC SO-DIMMs are called SO-CDIMMs.[14]

See also[edit]

  • Dual in-line package (DIP)
  • Memory geometry – logical configuration of RAM modules (channels, ranks, banks, etc.)
  • Rambus in-line memory module (RIMM)
  • Single in-line memory module (SIMM)
  • Single in-line package (SIP)
  • Zig-zag in-line package (ZIP)


  1. ^ abc'Are DDR, DDR2 and DDR3 SO-DIMM memory modules interchangeable?'. acer.custhelp.com. Retrieved 2015-06-26.
  2. ^Synology Inc. 'Synology RAM Module'. synology.com.
  3. ^'RAMCHECK 100-Pin DDR Adapter, a tool for testing and identifying JEDEC-compliant 100-pin DDR SO-DIMM modules'. memorytesters.com. 2013. Retrieved 2015-06-26.
  4. ^'Small-outline SDRAM module (MT16LSDF3264(L)H 256 MB and MT16LSDF6464(L)H 512 MB) Datasheet'(PDF). Micron Technology. 2006-05-03. p. 22. Retrieved 2015-06-26.
  5. ^'DDR DIMM & SODIMM Modules (184-pin DDR DIMM, 100-pin DDR DIMM, and 200-pin DDR SO-DIMM modules)'(PDF). smartm.com. 2011. p. 4. Retrieved 2015-06-26.
  6. ^'NT2GC64B(C)H4B0PS / NT4GC64B(C)88B0(1)NS / NT8GC64B(C)8HB0NS PC3(L)-10600 / PC3(L)-12800 Unbuffered DDR3 SO-DIMM'(PDF). nanya.com. December 2012. p. 23. Retrieved 2015-06-26.
  7. ^'DDR4 SDRAM SO-DIMM (MTA18ASF1G72HZ, 8 GB) Datasheet'(PDF). Micron Technology. 2014-09-10. p. 18. Archived from the original(PDF) on 2014-11-29. Retrieved 2015-06-26.
  8. ^Geof Findley; Becky Loop (2014-09-16). 'DDR4: The Right Memory for Your Next Server and High-End Desktop System'(PDF). intel.activeevents.com. Intel. p. 28. Archived from the original(PDF) on 2014-12-17. Retrieved 2015-06-26.
  9. ^'How Intel Plans to Transition Between DDR3 and DDR4 for the Mainstream'. techpowerup.com. 2014-09-14. Retrieved 2015-06-26.
  10. ^'DRAM – Can I mix DDR, DDR2 and DDR3 modules-my PC?'. integralmemory.com. Retrieved 2015-06-26.
  11. ^micron.com - 200 Pin, PC2700 DDR SDRAM Unbuffered SO–DIMM REFERENCE DESIGN SPECIFICATIONArchived 2010-09-23 at the Wayback Machine page 26
  12. ^'Corsair Memory – 4GB DDR3 SODIMM Memory (CM3X4GSD1066)'. corsair.com. Retrieved 1 October 2015.
  13. ^'204-Pin DDR3 SDRAM Unbuffered SODIMM Design Specification'.
  14. ^'Define-SO-CDIMM'. RAMpedia. Retrieved 2014-08-24.

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External links[edit]

Wikimedia Commons has media related to SO-DIMM.
  • Ruggedizing RAM for industrial systems (XR-DIMM form factor)
Ddr4 So-dimm Slots
Retrieved from 'https://en.wikipedia.org/w/index.php?title=SO-DIMM&oldid=995348628'

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Are DDR3 and DDR4 laptop memory (RAM) compatible? That’s a common question when it comes to memory upgrades. For instance, you bought a new laptop with DDR4 RAM and want to add more memory to it by inserting a DDR3 RAM module from your older laptop. You wonder if that’s possible. Unfortunately, that can’t be done. DDR3 and DDR4 laptop memory are not compatible / interchangeable.

First of all, a DDR3 laptop RAM module can’t physically fit into a DDR4 laptop RAM slot and vice versa. Notches on the connectors of memory sticks are on different places. The same applies to corresponding bumps in the RAM slots on notebook’s motherboards. Also, the number of pins doesn’t match. A DDR3 laptop memory module has 204 pins, whereas DDR4 has 260. Finally, DDR3 memory is a bit shorter than DDR4 – 2.66 versus 2.74 inches.

So, a DDR3 memory module won’t fit in a DDR4 slot…

And a DDR4 stick is incompatible with a DDR3 slot…

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Besides the physical differences, DDR3 and DDR4 RAM differ in voltages. DDR3 uses a voltage of 1.5V (or 1.35V for DDR3L variant). DDR4 uses 1.2V. It is more power efficient and generally faster, but doesn’t noticeably improve overall performance nor battery life of notebooks.

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Note: If you see “SODIMM” in specs of both DDR3 and DDR4 laptop memory, that doesn’t mean they are compatible. SODIMM only means they are small memory modules commonly used in laptops and some small form factor PCs, as opposed to physically much bigger DIMM memory used in traditional desktop computers. As a side note, DDR3 and DDR4 DIMMs aren’t compatible neither.