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How to enable 4GB in my Windows 7 64 bit?

My Windows 7 is 64-bit, and I thought that means it can use the full 4GB of RAM installed on the computer.

But I just saw this on my computer's properties: (So only 3.25GB is usable??)

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marked as duplicate by fretje, Diago Nov 8 '09 at 18:09

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
Maybe you're experiencing the same issues as: superuser.com/questions/35731/… –  John Allers Nov 8 '09 at 4:07

2 Answers 2

up vote 3 down vote accepted

This is usually down to either memory being shared against a graphics card or a motherboard limitation that prevents 4GB of memory being accessible.

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Graphics card seems to be more often the case as far as I have seen –  AdamV Nov 8 '09 at 8:30

Have you checked how much ram your video is sharing? Although with an experience score of 5.9 it's not too likely you are using on-board. Something to clarify in the details anyway.

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