Re: Memory ?
- From: "Ken Blake, MVP" <kblake@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 10 Feb 2008 18:29:30 -0700
On Sun, 10 Feb 2008 16:49:54 -0800, "titus12" <titus12@xxxxxxx> wrote:
I have 3.5GB of memory in my computer. Only 3328MB is showing. Is this
correct? I have WinXP Home. I first had 4GB installed and it said the
same. So I took a 512MB stick out to see if 3.5GB would show up. Now I
have a; 1GB, 2GB and 512MB stick in my computer. The 1GB is PC2-4300, the
2GB is PC2-6400 and the 512MB is PC2-5300. My motherboard is an Asus
P5GD2-X and I have a P4-430 3.0 processer.
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.
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 not available to
the operating system and applications. The amount you can use varies,
depending on what hardware you have installed, but is 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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