How To Check Maximum RAM Capacity For Your Windows PC

Random Access Memory commonly referred to as RAM is one of the most critical components of your computer. So it is kinda important to know what the maximum RAM capacity of your PC is for a couple of reasons. The RAM can be regarded as the CPUs right-hand man because RAM acts as a bridge between the CPU and the internal storage. Essentially, the CPU is too fast to interact directly with an SSD or HDD.

For that reason, CPUs use RAM to temporarily store program data. What actually happens is that when you run an application, it first loads all files required to run it on the RAM. This typically means the more RAM a PC has the better it will perform at handling multiple applications simultaneously. As much as you are able to add and upgrade your PC’s RAM, there are limits to how much RAM capacity your PC can take.

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Confirm Before Making The Order

Before you go online and order that 16GB DDR4 RAM, you need to do some compatibility checks. Because, what if your PC is only DDR3 compatible? Now you are $80 deep into a DDR4 RAM stick that will not work on your PC. Sometimes it can also be significantly cheaper to buy a cheaper model PC with a low pre-installed RAM capacity.

Which then means you can then upgrade it by adding more RAM to it at a later time. Key to note is that the maximum RAM you can install into your PC depends on a few factors; the motherboard, the CPU, and the Operating System. So, in this post, we will guide you on how to check which RAM is compatible with your PC as well as the maximum capacity you can install.


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Step 1: Check Installed RAM Capacity and Type Compatible

It should go without saying that you need to know how much RAM you already have installed before you decide how much to add. Another critical aspect is to determine the number of RAM slots free for use. For example, if your PC has two RAM slots and both are installed with RAM, for you to upgrade you need to let go of at least one installed RAM stick. So, to get this information we need to open the Task Manager. It is still on the task manager that we will also find out the type of RAM compatible with the system. To do this:

  • Press the Windows Key on your Keyboard and type Task Manager
  • Then Open the Task Manager application
  • On the Task Manager application, go to the Performance tab
  • On the Performance tab click on Memory on the left of your screen
  • You are now able to see: RAM type, installed capacity, and number of used and free RAM slots

Below is a sample showing a PC compatible with DDR3 RAM type, 8GB installed capacity, one used RAM slot, and one free RAM slot.

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Maximum RAM Capacity PC

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Step 2: Check The Maximum Capacity Your PC can Take Using Command Prompt

At this point, we now need to establish what is the maximum we can add to the PC. Using the example above. If say we find that the maximum that our sample PC can hold is 8GB, unfortunately, there will be no room for an upgrade. But if it can take more like say 12GB or 16GB, it means we can add 4GB or 8GB respectively to the one free RAM slot. To do this:

  • Press the Windows Key on your keyboard and type CMD.
  • Next, open the command prompt application.
  • In the command prompt type in or copy and paste the command below then press enter.
wmic memphysical get MaxCapacity, MemoryDevices
  • The Command prompt will now show the maximum RAM capacity that your PC can take in bytes. To convert to gigabytes (GB), divide the figure shown by 1,000,000. For our case below the maximum is 16GB. This means we can upgrade our sample PC below by adding an extra 8GB RAM stick on the unused RAM slot.
Maximum RAM Capacity PC

Upgrading your RAM is one of the easiest and fastest ways to improve the performance of a slow PC. We hope the above guide can help you bring back to life that old slow PC laptop that has been lying dead in your drawer. If anything is unclear kindly do not hesitate to let us know via the comment section below.


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