On Mon, 4 May 2009 13:21:24 +0200, "Steve" <Steve@ggmmaaiill.com>
> I have 32bit Vista Business and since yesterday there is 4 GB of RAM. Now,
> I've checked
> http://msdn.microsoft.com/en-us/library/aa906211.aspx and added "BCDEdit
> /set PAE forceenable" but Task Manager still can see only 3070 MB Physical
> How to setup Vista to use whole 4 GB RAM?
Sorry, but you can't.
All 32-bit client versions of Windows (not just Vista/XP) have a 4GB
address space. That's the theoretical upper limit beyond which you can
But you can't use the entire 4GB of address space. Even though you
have a 4GB address space, you can only use *around* 3.1GB of RAM.
That's because some of that space is used by hardware and is not
available to the operating system and applications. The amount you can
use varies, depending on what hardware you have installed, but can
range from as little as 2GB to as much as 3.5GB. It's usually around
Note that the hardware is using the address *space*, not the actual
RAM itself. The rest of the RAM goes unused because there is no
address space to map it too.
Ken Blake, Microsoft MVP - Windows Desktop Experience
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