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How to Find Out Which RAM a Computer Needs?

by Jennifer Claerr

Overview

The RAM (random access memory) that you must install in your computer is determined by the manufacturer. Even if you've lost your computer's user manual, you can easily find the right type of RAM for your computer. The salespeople in computer and electronics stores know the terminology used in selecting RAM modules. As long as you find the most important facts about what RAM your computer takes, they will be able to help you select the right modules.

Step 1

Examine the outside of your computer chassis. Look for the maker and model number, which is printed on the outside of the case. If the model number is not printed there, check your computer's system information by clicking "Start" > "My Computer" > "View system information" in Windows.
Step 2

Navigate to the website of your computer's manufacturer. Type the model number into the search field if one is provided. For example, if you have a Hewlett Packard Pavilion a6700z, go to hp.com and type "Pavilion a6700z" in the search box at the top of the page. Look for "Product Manual" or "User Manual" within the search results. Also look for the product specifications page.
Step 3

Download the user manual for your computer, preferably in PDF format. Search for "RAM" or "memory" within the user guide or the product specifications page.
Step 4

Check the total number of megabytes (MB) or gigabytes (GB) your computer can take in each RAM slot. Interpret the code provided by the manufacturer. For example, if the page states that the computer takes 2x1024, that means that you can install two 1-GB modules. Find the speed of the RAM in megahertz (Mhz). Determine the number of pins the RAM modules should have. Make a note of all of these factors on a piece of paper.
Step 5

Find whether your computer takes Single Data Rate or Double Data Rate (DDR) memory. Also determine whether it needs DDR2 or DDR3 memory. Determine whether it has any special requirements. For example, if your computer is older, it may require Single Inline Memory Modules (SIMMs) rather than Dual Inline Memory Modules (DIMMs). Add all of these features to your notes. If your computer requires Rambus memory or RIMMs, write this down as well.
Step 6

Go to the electronics store with your notes in hand. Tell the salesperson in the computer memory or upgrades department exactly what type of memory your computer takes. Be very precise when ordering computer memory and don't omit any detail.

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In most cases you should install unbuffered, dynamic, non-error-correction code (non-ECC) RAM. Avoid static and ECC RAM, which are significantly more expensive and offer no real benefits.
In most cases you should install unbuffered, dynamic, non-error-correction code (non-ECC) RAM. Avoid static and ECC RAM, which are significantly more expensive and offer no real benefits.
Always discharge the static electricity from your body by touching an unpainted part of the computer chassis before removing or installing RAM. Hold RAM modules by their edges and avoid touching the memory chips directly.
Always discharge the static electricity from your body by touching an unpainted part of the computer chassis before removing or installing RAM.
Hold RAM modules by their edges and avoid touching the memory chips directly.