Hello Joe,
The firmware has to support the re-mapping. (workstation and server
machines usually do)
The processor has to support the remapping( most current processors
should).
You need to be running with PAE enabled
Now the hardware can be remapped above the 4 gig addess space. However
not
all drivers work well after being remapped so other issues can occur.
Thanks,
Darrell Gorter[MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights
--------------------
|>From: "Joe Guidera" <
[email protected]>
|>References: <
[email protected]>
<
[email protected]>
<oRer1#
[email protected]>
|>Subject: Re: Vista 32bit does not recognise 4GB memory
|>Date: Sun, 4 Mar 2007 20:23:58 -0600
|>Keywords: < Not Specified >
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|>Agreed, however shouldn't enabling memory re-mapping (which if I recall
maps
|>the address space above the 16GB line which properly allows hardware
devices
|>to map within the first 4GB of address space) solve the issue? Or does
|>Vista not handle this? I know server does, but does Vista?
|>
|>Joe
|>
message
|>|>> Hello,
|>> Sorry but no. The hardware in the system is reserving the address
space.
|>> Since 32-bit processors are limited to 4 gig of address space,
hardware
|>> that requries addressing( like video cards or other devices including
PCI)
|>> has to reserve some of the address space, thus limiting the amount of
RAM
|>> that is available to Windows. Windows is not reserving that memory,
the
|>> hardware in the system is reserving that space. Since there is a
|>> limitation of 4 gig of address space and there is overlap, the amount
of
|>> RAM that can be addressed is reduced by the amount of address space
the
|>> hardware requests.
|>> Thanks,
|>> Darrell Gorter[MSFT]
|>>
|>> This posting is provided "AS IS" with no warranties, and confers no
rights
|>> --------------------
|>> |>Thread-Topic: Vista 32bit does not recognise 4GB memory
|>> |>thread-index: Acdd5zio4a06f0dITDOOQxEcwejddQ==
|>> |>X-WBNR-Posting-Host: 67.35.76.243
|>> |>From: =?Utf-8?B?cm9nZWxhaA==?= <
[email protected]>
|>> |>References: <
[email protected]>
|>> |>Subject: RE: Vista 32bit does not recognise 4GB memory
|>> |>Date: Sat, 3 Mar 2007 14:56:47 -0800
|>> |>Lines: 41
|>> |>Message-ID: <
[email protected]>
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|>> |>Newsgroups: microsoft.public.windows.vista.installation_setup
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|>> |>Xref: TK2MSFTNGHUB02.phx.gbl
|>> microsoft.public.windows.vista.installation_setup:11232
|>> |>NNTP-Posting-Host: TK2MSFTSBFM01 10.40.244.148
|>> |>X-Tomcat-NG: microsoft.public.windows.vista.installation_setup
|>> |>
|>> |>
|>> |>
|>> |>"GreatGuruMemsahib" wrote:
|>> |>
|>> |>> I am having a problem with Windows Vista 32bit. I have installed
4GB
|>> Kingston
|>> |>> 667 memory on an ASUS P5B Deluxe motherboard. Vista only
recognises
|>> 3GB
|>> of
|>> |>> the memory. I understand that certain devies require memory mapped
|>> access. I
|>> |>> have a 256MB video card that will take up sojme of the available
|>> address
|>> |>> space. I also understand that 32bit versions of Vista limit the
total
|>> |>> available memory to 3.12GB.
|>> |>>
|>> |>> I have attempted to enable the memory remapping feature in the
BIOS
|>> setup.
|>> |>> When I return to Vista, it only recognizes 2GB of memory.
|>> |>>
|>> |>> Is there any way around this problem other than installing the
64bit
|>> version
|>> |>> of Vista?
|>> |>>
|>> |>> In addition, if installing the 64bit version of Vista, will all of
my
|>> |>> applications run successfully? I do have a few custom business
apps
|>> running
|>> |>> and I do not know whether they have drivers for 64bit operation.
|>> |>>
|>> |>> Thanks I realize that all of this is quite complex, but I am
curious
|>> as
|>> to
|>> |>> whether there are any answers out there.
|>> |>
|>> |>It is not a problem. You can look in your BIOS and see if you have
4GB.
|>> The
|>> |>operating system has to have some space allocated for it to do its
work;
|>> it
|>> |>needs buffers for I/O and needs to have memory to allocate for the
data
|>> |>structures it needs to keep track of things. The 3.12GB is the
amount
of
|>> |>space that can be allocated for your Working Set. Actually, your
working
|>> set
|>> |>in memory at any one time may be less. There may also be other
programs
|>> in
|>> |>memory at the same time; such as your mail agent that periodically
|>> checks
|>> for
|>> |>mail. Ideally, the operating system tries to keep in memory what it
may
|>> need
|>> |>next. If it doesn't have it in memory then it has to fetched from
|>> virtual
|>> |>memory. That may mean that other parts of your working set that are
not
|>> |>likely to be needed are overlaid by the code bing fetched.
|>> |>
|>> |>I don't think you need to go to 64-bit just because 64-bit can
address
|>> 2^64
|>> |>locations. If you have only 4GB of memory and a 64-bit operating
system
|>> there
|>> |>will still be the same allocation for the operating system. If you
add
|>> memory
|>> |>over 4GB then you will need a 64-bit operating system to access the
|>> memory
|>> |>above 2^32 locations.
|>> |>
|>>
|>
