Why the system writes: installed 4 GB of ram, but usable only 3.6 GB of ram?

Why the system writes: installed 4 GB of ram, but usable only 3.6 GB of ram?

On Wednesday, March 6, 2013 15:02:32 + 0000, DanielOrtner wrote:

Why the system writes: installed 4 GB of ram, but usable only 3.6 GB of ram?

3.6 GB is a very good number - much higher than most people's.

All versions of Windows 32-bit client (not just XP/Vista/7/8) have a
Address 4 GB of space (64-bit versions can use much more). It's the
theoretical upper limit beyond which you cannot go.

But you can't use the whole address space. Even if you have a
Address space of 4 GB, you can only use around 3. 1 GB of RAM (and as I
said, you do much better than that). This is because some of
This space is used by the hardware and is not available for the operation
system and applications. The amount you can
use varies, depending on what hardware you have installed, but can
range from as little as 2 GB to 3.5 GB. It's usually around
3. 1 GB.

Note that the hardware is using the space, not the real address
The RAM itself. If you have a larger amount of RAM, the rest of the RAM
goes unused because there is no address to map space to.

Tags: Windows

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