4 GB of RAM in x64

[Gabriel Perez]

why windows 64 bits either xp or vista can use 4 GB of RAM and 32 bit
version only report 3 GB , what happened to the other GB , is it idle? or
simply cannot be addressed

thanks

 

[Theo]

Re: 4 GB of RAM in x64

Because that is a design feature of the Intel 8086 chip
dating back to the early 1980's when it was perceived that
no one would ever have that much memory nor need to approach
that memory limit! It's called a memory hole. It's just
below the 4GB boundary and that is where the BIOS
information is place when the system boots.


Gabriel Perez wrote:
> why windows 64 bits either xp or vista can use 4 GB of RAM and 32 bit
> version only report 3 GB , what happened to the other GB , is it idle?
> or simply cannot be addressed
>
> thanks

 

[Carlos]

RE: 4 GB of RAM in x64

Gabriel:
Here's what you are looking for:
http://support.microsoft.com/default.aspx/kb/929605/en-us
Or...
Aqui esta lo que estas buscando en español:
http://support.microsoft.com/kb/929605/es

Carlos

"Gabriel Perez" wrote:

> why windows 64 bits either xp or vista can use 4 GB of RAM and 32 bit
> version only report 3 GB , what happened to the other GB , is it idle? or
> simply cannot be addressed
>
> thanks
>
>

 

[miso@sushi.com]

Re: 4 GB of RAM in x64

On Aug 2, 8:33 am, "Gabriel Perez" <gabriel2...@msn.com> wrote:
> why windows 64 bits either xp or vista can use 4 GB of RAM and 32 bit
> version only report 3 GB , what happened to the other GB , is it idle? or
> simply cannot be addressed
>
> thanks

Just as a reminder, some motherboards require a "memory remap" to see
all the DRAM.