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Windows 7: Question on Available RAM - Win7 32-bit vs. 64-bit

01 Jan 2012   #1

Windows 7 Professional 32bit
 
 
Question on Available RAM - Win7 32-bit vs. 64-bit

Hi all -

Why is there a 4gb RAM limit with Windows 7 32-bit?

I just installed the 64-bit version and now have all of my installed RAM (8Gb) available to the OS.

My System SpecsSystem Spec
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01 Jan 2012   #2

Microsoft Community Contributor Award Recipient

Windows 7 SP1, Home Premium, 64-bit
 
 

My System SpecsSystem Spec
01 Jan 2012   #3

Windows 7 Pro x64
 
 

For 32 bit operating systems the address length is 32 bits, which only allows 2 ^ 32 (4 294 967 296) addresses. Now, looking at that number it might seem like your operating system should support 4 GB, but all the other hardware such as your graphic card or any other card that contains memory (the video ram in your graphic card) that has internal memory also gets mapped into that address space which subtracts from that 4 Gigs, so if you have a graphic card with 512MB or ram your 4 Gig system would show 3.5 Gigs of usable memory.
My System SpecsSystem Spec
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 Question on Available RAM - Win7 32-bit vs. 64-bit




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