How To Find How Many Ram Slots Are Used

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The total amount of memory, or RAM, a computer can have is dependent on the motherboard installed in the computer and the operating system. In general, most motherboards will support either two or four memory modules, but the type and amount of memory can differ widely from one motherboard to the next.

Tip

To determine if the RAM modules are DIMM or SODIMM form factor, use these steps: Open Start. Type Command Prompt, right-click the top result and select the Run as administrator option. Most commonly used motherboards have two to three RAM slots, and some also have four slots. High-end motherboards can have more than four slots. Some motherboards also have as many as 8 RAM slots. Anyone can open their CPU cabinet to look into their motherboard to know the exact numbers of slots are in it and how many are available.

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If you are trying to find memory specifications for upgrading your computer memory, see: What type of computer memory to use in a memory upgrade?

Note

If you are not sure what operating system you have, see: How to find what operating system is on a computer.

Microsoft Windows computers

How much ram your computer can hold depends on if you're running a 32 or 64-bit version of Windows, which depends on your CPU. The capacities are as follows, permitting you have the physical space to fit the RAM modules.

  • 32-bit systems - up to 4 GB
  • 64-bit systems - up to 128 GB

How to find out if you have a 32-bit or 64-bit version of Windows

  1. Press the Windows key and the Pause/Break key at the same time.
  2. A new window should appear that says System at the top, similar to the one below.
  1. Under the System section, next to System type:, you can see if your version of Windows is 32-bit or 64-bit.

Once you know the type of memory and the total amount of memory the computer supports, you can increase the amount of memory by installing additional sticks of RAM. You can also replace existing sticks of RAM with ones having a higher amount of memory.

Apple macOS computers

  1. Click the Apple icon in the upper-left corner to open the Apple menu.
  2. In the drop-down menu that appears, select About This Mac.
  3. You should see a window open that is similar to the one below.
  1. Visit Apple's page for a table containing the max RAM for each machine, based on the information in the iMac section in the above window.

Once you know the type of memory and the total amount of memory the computer supports, you can increase the amount of memory by installing additional sticks of RAM. You can also replace existing sticks of RAM with ones having a higher amount of memory.

Linux and Unix-based computers

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Similar to a Windows-based computer, Linux-based machines' maximum RAM is based on whether they have 32-bit or 64-bit architecture. Most 32-bit Linux systems only support 4 GB of RAM, unless the PAE kernel is enabled, which allows a 64 GB max. However, 64-bit variants support between 1 and 256 TB.

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To determine how much ram your Linux-based computer supports, open the Terminal (Ctrl+Alt+T) and type in the following command:

Look for the Maximum Capacity section to see the limit on RAM.

Once you know the type of memory and the total amount of memory the computer supports, you can increase the amount of memory by installing additional sticks of RAM. You can also replace existing sticks of RAM with ones having a higher amount of memory.

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Additional information

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  • See the RAM and memory definition for further information about each of these terms and related links.