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Vista Business 32 bit support 4 GB RAM ?

This is a discussion on Vista Business 32 bit support 4 GB RAM ? within the Windows 7 , Windows Vista Support forums, part of the Tech Support Forum category. Hi everyone Is Vista Business 32 bit support 4 GB RAM ? Thanks


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Old 06-06-2011, 12:26 AM   #1
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Hi everyone

Is Vista Business 32 bit support 4 GB RAM ?


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Old 06-06-2011, 01:23 AM   #2
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Hi 32 bit system address up to 4gb 2^32 however I guess you are wondering why you only show 3+ something Ram. From my notes:-

32 bit operating systems support a physical address range of up to 4gb, however this range is sub divided to manage both the computers PCI address range (also known as MMIO, or referred to as the kernel) and Ram.The PCI address range is used to manage much of the computer's components including the BIOS,IO cards,networking, PCI hubs, bus bridges, PCI-Express, and todays high performance video cards (including their memory).Typically this amts to .6 to 1.2 gb for the PCI address range.

On boot up the Bios allocates PCI addresses down from 4GB to manage the computers components, then the bios allocates physical user Ram from address 0 up to the bottom of the PCI address range or up to the amount of the installed physical Ram whichever is less. The upper limit on available physical Ram is usually between 3GB and 3.4GB.
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Old 06-06-2011, 10:06 PM   #3
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Originally Posted by jenae View Post
Hi 32 bit system address up to 4gb 2^32 however I guess you are wondering why you only show 3+ something Ram. From my notes:-

32 bit operating systems support a physical address range of up to 4gb, however this range is sub divided to manage both the computers PCI address range (also known as MMIO, or referred to as the kernel) and Ram.The PCI address range is used to manage much of the computer's components including the BIOS,IO cards,networking, PCI hubs, bus bridges, PCI-Express, and todays high performance video cards (including their memory).Typically this amts to .6 to 1.2 gb for the PCI address range.

On boot up the Bios allocates PCI addresses down from 4GB to manage the computers components, then the bios allocates physical user Ram from address 0 up to the bottom of the PCI address range or up to the amount of the installed physical Ram whichever is less. The upper limit on available physical Ram is usually between 3GB and 3.4GB.

Thanks a lot for your answer, And when i put 4 gb ram, BIOS showing. Infact still i not yet install any OS, just asking before, OR i should i install XP 64 bit ...? if yes than is there any programme combatibility ( 64 bit) etc.
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Old 06-07-2011, 12:14 AM   #4
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Hi, well it depends on your system, both Vista and Seven have an upgrade advisor get it from MS, will tell you if your system will run V\7. I would not install XP 64 that's a backwards step. If your system supports 64 bit then I would go for it. Up to you, for the average home user it is difficult to tell any quantifiable advantage 64 over 32 at the present time.
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