How much RAM can Windows 8 64 bit use ?

I am running Windows 8 64 bit version on a Lenovo X301 with 8 gb RAM.  I do not seem to be able to use more than 3,5 gb with my 2013 Office (preview).  The Office 2013 Preview is a 32 bit version.  Is this the reason or are there other reasons / tweeks ?

Hi Ulrik,


Thanks for posting this question in Microsoft Community.

I would appreciate if you could answer the following questions:

1. Are you facing any other performance related issues?
2. Do you have any third party security program installed on the computer?
3. Are you aware of any changes made to the computer prior to the issue?

To learn more about the Memory Limits for Windows, you may go through the article and check.

You may also go through the steps from the article and check if it helps.

Here is another article on improving the computer performance.

Hope this information is helpful and do let us know if you need further assistance. We will be glad to help.
Rohit Chettri
Forum Moderator

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Question Info

Last updated September 10, 2018 Views 4,711 Applies to: