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I recently bought a small tower computer (Dell OptiPlex, Intel Core 2 Duo 2.9GHz E7500 Processor, 4GB Memory, 160GB Hard Drive, DVD, Windows 10 Home, WiFi) that said it takes DDR3 RAM, so I bought this RAM off of Amazon.com (Samsung 2GB PC-8500 DDR3 1066MHz SO-DIMM 204 Pin 2.0GB Memory Upgrade Modules M471B5673FH0-CF8).

However, when it arrived it was a third the size of the ram it should be replacing, and does not fit. Does the computer not take DDR3 Ram? Are there multiple sizes of RAM? Is the product listing on Amazon wrong?

Pictures for reference below.

Dell OptiPlex

Samsung 2GB PC-8500 DDR3 1066MHz

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    I advise you to study up on the different types of DDR3 RAM before purchasing again. There are only a few distinctions you need to be aware of, but they are important distinctions and they are all well documented. – music2myear Jun 8 '18 at 16:56
  • Sites such as Crucial and Kensington will walk you through all the RAM options for your particular computer. – DrMoishe Pippik Jun 22 '18 at 18:47
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You bought SO-DIMMs instead of regular RAM modules. The ones you got are meant to used in smaller form factor computers (e.g. laptops).

6

You bought an SO-DIMM module rather than a DIMM.

SO-DIMM modules are used in laptops where space is at more of a premium than desktop machines. The "SO" stands for "Small Outline"

Generally if you are in doubt of what type of modules you need then you should check your motherboard manual, or Crucial have a memory checker that can scan your system and suggest memory modules that should work.

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