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Installing SODIMM Memory in your Laptop

This guide was developed to instruct readers on the proper procedures for installing SODIMM memory module into a laptop computer. It includes step-by-step instructions for the physical installation of a memory module into those laptop systems that have an access panel to the memory modules. Not all laptops have this type of access. If yours does not, then it will probably require installation from an authorized technician.

For additional information about installing computer memory into your computer system, it is recommended that you read any user manuals that came with your computer for specific procedures that may be required. For more information for purchasing memory upgrades for a computer, please refer to the Before You Buy Memory upgrades article.

Step 1: Get out the tools you'll need.

Non-magnetic screwdriver (for opening your case)

Your computer manual

Step 2: Ground yourself.

Static electricity can damage your module and other computer parts. You need to ground yourself to avoid 'shocking' your computer. If you have wrist straps designed for this purpose, you should wear them. If you don't have wrist straps, here is the easiest way to ground yourself:

  • Turn off the computer, monitor, and all accessories (printer, speakers, etc.)
  • Leave the computer power cord plugged in. (It's OK to unplug your accessories if you like.)
  • Briefly touch an unpainted metal part of your computer case.
  • Plant your feet and don't walk around. If you do need to walk around, ground yourself again before touching any of the internal parts of your computer.

Step 3: Open your computer case.

Every laptop case is a little different, so consult your manual to find out where your SODIMM slots are located and how to open that part of your laptop case. Some of the most popular places for SODIMM slots are:

  • Under the keyboard
  • Behind a back access panel

Locate the panel used for access to the memory modules. This is generally located on the bottom of the laptop computer. Refer to your laptop instruction manuals for locating the panel.

Remove any screws that the panel in place and place somewhere safe to prevent losing it.

Step 4: Find the SODIMM slots and banks.

Remove the panel from the laptop and set aside.

SODIMMs fit into slots that look like this. Some of your slots may be already filled with modules.

SoDIMM Slot
This notebook has two slots. Some notebooks may have only one slot.

While most SODIMMs are installed individually, some SODIMMs must be installed in matched pairs known as 'banks.' The memory banks on your motherboard should be clearly labeled.

Step 5: Remove the memory you are replacing (if necessary).

If you have an open SODIMM slot, skip this step and go on to Step 6. If all of your SODIMM slots are full, you will need to remove one or more of your old modules before you can install the new memory.

  • Press down on the retaining clips on either side of the module.
  • Remove the module from the slot.

If replacing or upgrading an existing memory module, remove the memory modules by undoing and module clamps and gently lifting the edge of the module to a 45-degree angle and then pulling the module out of the slot.

Step 6: Install your new module(s).

  • Take your module out of its anti-static bag and hold it by the edges.
  • If you have more than one open slot, fill the lowest numbered slot first.
  • Line up the notches in the row of metal pins at the bottom of your module with the keys in the SODIMM slot on your motherboard. (If the notches don't line up right away, flip your module around and try it the other way. It doesn't matter which side of your module has the black chips or the stickers on it. The important thing is to line up the notches.)

Align the notch of the memory module with that of the memory slot and gently insert the module into the slot at a 45-degree angle.

Once all the pins are in the slot, gently rotate the module down flat until the clamps lock into the module into place.

Step 7: Test it.

Once the memory has been installed into the computer, the physical process is complete. When the computer is powered back up, it may be necessary to go into the computer BIOS to let the system properly detect the new RAM that has been installed in the computer. Please refer to the user manual for the computer system for any additional information.

Before you close your case, turn your computer back on. You should see the new amount of memory displayed on your startup screens or in the properties for 'My Computer' (if you use a Windows operating system). If everything works correctly, skip to Step 9. If not, go to Step 8.

Step 8: Troubleshooting

If you have trouble with your new RAM, check these things first.

  • Check the power cords. Is everything plugged in properly?
  • Check the module. Did both side clips snap to hold the module firmly in place? Try removing the module and replacing it to make sure it is seated properly in the slot.
  • Check the wires and cables inside your computer. Did you accidentally bump one of the cables inside your computer while you were installing your module? A loose hard drive cable can prevent your computer from booting up properly. Make sure all the cables are firmly in their sockets.

Step 9: Close your case.

Replace the memory access panel.

Replace any screws or fasteners that hold the panel in place.

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Two Sodimm Slots Support Up To 8gb

That’s two 1GB DIMMs in two slots and two 512MB DIMMs in the other two slots. Yes, you may end up throwing away memory to upgrade. If your PC is configured with 1GB of memory using 4 256 MB DIMMs and you want 2GB of memory total, you have to throw away all the 256MB DIMMs and replace them with a combination of DIMMs. If only two of the blue memory slots are populated with matched DIMMs, dual-channel mode is enabled. Quad-channel mode This mode is enabled when four (or a multiple of four) DIMMs are identical in capacity and speed, and are put in quad-channel slots. When two memory modules are installed, the system operates in dual-channel mode. Slots Two SODIMM slots Type Dual-channel DDR4 Speed Up to 2133 MHz Configurations supported 4 GB, 6 GB, 8 GB, 12 GB, and 16 GB. 0 Kudos Dell Support Resources. Two SODIMM slots supporting dual-channel memory 1024MB, 2048MB and 4096MB SODIMMs. Upgradeable to 8GB with 4GB SODIMMs in slots 1 and 2.

16 GB SO-DIMM modules are now starting to become generally available from multiple vendors, which eases RAM constraints in devices that have a limited number of slots for RAM modules.

A 200-pin PC2-5300 DDR2 SO-DIMM

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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]

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

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  • 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]

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]

Sdram vs sodimm
  • 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)

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References[edit]

  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.

External links[edit]

Wikimedia Commons has media related to SO-DIMM.
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  • Ruggedizing RAM for industrial systems (XR-DIMM form factor)
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