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You can use either a 32bit or 64bit operating system (OS) for 4GB of RAM.

4GB of memory is the limit a 32bit OS can handle, this includes any memory that your graphics card has, so your computer may recognise only 3.5GB of RAM if you have a 512MB GPU.

You will need a 64bit os that will use all of the ram.

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Q: Do you need 32bit or 64bit for 4gb of ram?
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