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Why does Windows only show about 3.5GB of my 4GB+ of RAM?
64-bit Windows 7 can only use 3.25GB of RAM instead of 4GB?

I'm using Windows 7 SP1, 64-bit, and the system only uses 3 GB out of the 4 GB I have.
Why? How I can make it use more?

While monitoring my system memory, I see I always have ~1024 MB free even when I know the system needs much more memory because I "fell" the paging when re-accessing an application after 15 minutes.

I'm now with 4 instances of VS10 open with really big solutions; Google Chrome, and Internet Explorer 9 are open, each with a few tabs; OutLook is running, and there are few more small applications running at the same time.

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migrated from stackoverflow.com Feb 28 '12 at 14:54

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marked as duplicate by slhck, Diogo, Sathya Feb 28 '12 at 15:20

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.

Not sure if it's an exact duplicate – the other one is using 32 Bit Windows. –  slhck Feb 28 '12 at 15:12
Can you clarify exactly what you're seeing? What it telling you that 1024MB is "Free"? A screenshot would be the most helpful. (Different tools report memory usage in different ways.) –  David Schwartz Feb 28 '12 at 15:13
This is not a duplicate. The first question is about 32-bit operating systems. The second is about inaccessible memory, not free memory. –  David Schwartz Feb 29 '12 at 9:52