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Why does Windows only show about 3.5GB of my 4GB+ of RAM?

I have a a Lenovo G560 Laptop ...i have 4 GB ram in laptop but in windows XP its shows 2.93 GB usable ..

But i want it uses total 4 GB RAM ...

How to do that ?

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migrated from Mar 29 '11 at 2:51

This question came from our site for professional and enthusiast programmers.

marked as duplicate by Journeyman Geek, Moab, Sathya Mar 29 '11 at 6:21

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.

It looks like you can upgrade to Windows XP Professional x64 Edition, but there are a bunch of little limitations and compatibility issues you might have with it.

Since you're going to have to buy a new Windows License anyway, you might as well upgrade to Vista or Windows 7. Windows XP almost 10 years old, and nearing the end of its life.

According to a couple websites selling the Lenovo G560, it ships with Windows 7 64-bit these days, so there should be no compatibility problems.

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Skip Vista and get the Windows 7 license. – emgee Mar 29 '11 at 4:34

You need to upgrade to a 64-bit OS so that all of the memory can be addressed.

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PAE does exist... – soandos Jul 12 '12 at 17:56