How to Find Out the Maximum RAM Capacity for Your Computer (2024)

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  • Computers
  • Computer Hardware
  • Computer Memory

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1Checking Your Operating System

2Checking Your Motherboard

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Last Updated: January 11, 2024Fact Checked

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RAM (Random Access Memory) is the memory that your computer uses to store data from programs that are in use. Generally, the more RAM you have installed, the more programs you can run at once. The amount you can install, however, is determined by both your hardware and your computer's operating system. You will need to check both to figure out how much RAM you can add to your computer.

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Checking Your Operating System

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  1. 1

    Determine if Windows is 32-bit or 64-bit. The Windows operating system has a maximum amount of RAM that it will recognize. If you have more RAM installed than is allowed, the extra RAM will not be used. This limit is determined by whether Windows is 32-bit or 64-bit.[1]

    • See this guide for details on checking your copy of Windows. Generally you can see whether Windows is 32- or 64-bit from the System Properties window (⊞ Win+Pause)
    • 32-bit can support up to 4 GB (for all versions) of RAM
    • 64-bit can support up to 128 GB (Windows 10 Home) to 2 TB (Windows 10 Education, Enterprise, Pro) of RAM[2]

  2. 2

    Check your Mac model. The amount of RAM your Mac can support depends on the model you are using. Many Macs have differing amounts of supported memory. Check your Mac's documentation for exact numbers. Some of the more popular models include:[3]

    • iMac (27-inch, Late 2013) - 32 GB
    • iMac (2009-Late 2012) - 16 GB
    • iMac (2006-2009) - 4 GB

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  3. 3

    Determine how much your Linux system supports. A 32-bit Linux installation may only support up to 4 GB, but if it has the PAE kernel enabled (most newer distributions do), then a 32-bit system can support up to 64 GB of RAM. A 64-bit Linux system can theoretically support up to 17 billion GB of RAM, though most cap out at 1 TB (Intel) or 256 TB (AMD64).[4]

    • To determine the exact amount your system can support, open the Terminal by pressing Ctrl+Alt+T. Type sudo dmidecode -t 16. You will be asked for the administrator password. Look for the Maximum Capacity: entry.

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  1. 1

    Identify your motherboard. Even if your operating system supports a ton of RAM, you are still limited by what your motherboard can support. If you don't have access to your motherboard documentation, you will need to identify the motherboard and look up the specifications online.

    • You will most likely need to open your computer case and note the motherboard's model number.

  2. 2

    Check the motherboard's documentation. Near the beginning of your motherboard's documentation, you should be able to find a specifications chart or page. Look for the maximum amount of RAM or System Memory that can be installed. You will also see the number of available slots on your motherboard.

    • RAM needs to be installed in pairs. If your motherboard supports 16 GB of RAM and has four slots, you can install four 4 GB sticks or two 8 GB sticks to reach your maximum.

  3. 3

    Use a system scanning tool. If you are uncomfortable opening your computer or reading through your motherboard documentation, there are several tools available online that can scan your system and report how much memory you can have, as well as the type and speeds supported.

    • You can find these scanners on major memory manufacturers' and retailer's websites, such as Crucial or MrMemory.

  4. 4

    Upgrade your RAM. After you determine how much RAM your system can support, you can install your new RAM. Make sure that if you are adding new RAM to existing RAM that the clock speed matches the original RAM. See this guide for detailed instructions for installing new RAM.[5]

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Community Q&A

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  • Question

    Can I change my original RAM if I have only one slot for RAM in my computer?

    How to Find Out the Maximum RAM Capacity for Your Computer (12)

    Community Answer

    Yes, but make sure you also know your operating system capacity. If you are using 32bit Windows, its maximum capacity is 4GB.

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    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission.Support wikiHow

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  • Question

    There are two slots in my PC. Can I install 4 and 8 GB RAM there? It is a 64 bit PC.

    How to Find Out the Maximum RAM Capacity for Your Computer (13)

    Community Answer

    Yes, you can. Just make sure they are both the same type, speed, voltage, etc. Check that as much as possible is the same (except RAM amount) so it works. It takes lots of research.

    Thanks! We're glad this was helpful.
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  • Question

    Can increasing the RAM on my computer make it work faster and not freeze?

    How to Find Out the Maximum RAM Capacity for Your Computer (14)

    Community Answer

    See Also
    How Much RAM Do I Need for Gaming?

    Yes. But if it is still sluggish, remove unnecessary programs and data on desktop, and browser caches.

    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission.Support wikiHow

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      About This Article

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      wikiHow Technology Team

      wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. To create this article, 16 people, some anonymous, worked to edit and improve it over time. This article has been viewed 683,538 times.

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      Co-authors: 16

      Updated: January 11, 2024

      Views:683,538

      Categories: Computer Memory

      Article SummaryX

      If you’re using a Mac, search for your system model on the Apple website to find out the maximum amount of RAM it can handle. If you’re using a 32-bit version of Windows, your system can support up to 4 GB. If you’re using a 64-bit version of Windows, it can handle up to 128 GB.

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      Reader Success Stories

      • How to Find Out the Maximum RAM Capacity for Your Computer (25)

        Ann Engel

        Dec 3, 2016

        "I was trying to determine my HP netbook's capacity in order to add to the existing memory. Fortunately, for..." more

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