Re: XP with more that 4GB
- From: "Ken Blake, MVP" <kblake@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 28 Jul 2008 16:06:51 -0700
On Mon, 28 Jul 2008 23:31:47 +0100, "Mark Natto"
<natto@xxxxxxxxxxxxxx> wrote:
As I am not too keen on Vista, even on a Dual 3.6GHz with 8GB , I would
rather the resources goes to my programs rather than the OS so I decided to
move back to XP, the BIOS sees all 8GB and XP sees 3.5GB, I am just
wondering if there are any utilities that can make use of the memory above
the address, ie, such as turning it into a cache/HDD ??
I assume you're running 32-bit XP.
All 32-bit versions of Windows (not just XP) have a 4GB address space.
That's the theoretical upper limit beyond which you can not go.
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
3.1GB.
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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