Memory Limitations..
Shane Parsons
Does anyone out there know about a memory limitation of WindowsNT? I know
someone who is setting up a PC with 4Gb of Ram and wants to run NT.
If you know please email me at my email address. Thanx!
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Shane Parsons B.ScE. (Civil), Queen's '98
Comp-Sci Student, Queen's '00
"the race is long, and in the end,
it's only with yourself"
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UchicagoNews
You'll only be able to *use* 2GB of that memory for the actual user and
system applications, however, due to the way NT partitions memory for it's
internal uses.
HTH
Jeff
Shane Parsons <3s...@qlink.queensu.ca> wrote in message
news:7mcn0o$k0a$1...@knot.queensu.ca...
Roger J.Hamlett
>
> Hello,
> Does anyone out there know about a memory limitation of WindowsNT?
I know
> someone who is setting up a PC with 4Gb of Ram and wants to run NT.
> If you know please email me at my email address. Thanx!
to be used for 'applications', with the rest reserved for drivers and
system stuff. There was a change a while ago (in one of the service
packs?, or it may have been specific to some manufacturers), that
changed this, to allow a 3/1 split. Realistically going much over 3GB
is therefore going to be of limited use. Also he must be careful of
the cache limitations of the processors concerned (only Xeons go
this high), and the number of memory slots available...
Best Wishes
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Nik Simpson
UchicagoNews <jcar...@babies.bsd.uchicago.edu> wrote in message
news:FErLx...@midway.uchicago.edu...
> NT *supports* 4GB of memory just fine.
>
> You'll only be able to *use* 2GB of that memory for the actual user and
> system applications, however, due to the way NT partitions memory for it's
> internal uses.
>
You are confusing physical memory address and virtual memory addressing. The
2GB limitation is on virtual address space. A 32 bit OS has (assuming it's
implemented fully) the ability to address 4GB of virtual memory/application,
however critical OS stuff has to be mapped in somewhere as well, so NT's
virtual address space is 4GB split 2GB for application and 2GB for OS,
multiple applications can each have that amount of virtual memory allocated.
NTS/E changes that split to 3/1 (OS gets 1GB) so it allows each application
more room to breathe.
What I can't understand is why anbody would a "PC" with 4GB of memory, I
have to assume the term was being used generically to refer to a 4-way XEON
or hi-end Alpha box which is about the only thing you could put 4GB of
physical memory in and run NT on. Your average home PC (and dual PIII boxes
for the most part) can't possibly address more than 1GB of physical memory
because of hardware limitations.
--
Nik Simpson