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I just installed 2 gb extra ram memory in my pc (going from 2 to 4 gb). However, it seems like windows vista doesn't use it:

enter image description here

In windows task manager it says I've got only 3 gb of physical memory. In the system settings it does recognize 4 gb. Is this something that I should fix (for better performance). If so, how could I fix this ?

Edit
I still don't know how to fix this. I hope this screenshot will help identify the problem: enter image description here

I've no clue how installed RAM is 4 GB, and total phsycal memory is 2.94 GB. Can anyone explain ?

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Are you using integrated graphics? How much RAM is allotted to it? –  Karan Jul 15 '13 at 17:06
    
Assuming you are using a 32-bit version of Vista, this is a duplicate of this question: superuser.com/questions/292563/… –  uSlackr Jul 15 '13 at 17:31
1  
@uSlackr I think it is clear from the picture that I'm using 64-bit. –  Kasper Jul 15 '13 at 17:44
    
@Karan I don't have integrated graphics. I have ati radeon 1900 XTX –  Kasper Jul 15 '13 at 17:44
    
Use RAMMap and see what's using the 1GB of RAM. –  Karan Jul 15 '13 at 17:46

1 Answer 1

Mark Russinovich's article is still the best explanation for all this that I've found: http://blogs.technet.com/b/markrussinovich/archive/2008/07/21/3092070.aspx

He discusses the memory ranges takes by drivers, etc that limit what's available in 4GB systems.

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Doesn't seem to explain why Total Physical Memory shown in Task Manager is 1GB less than the Installed Memory shown in System Properties. –  Karan Jul 16 '13 at 2:58

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