Re: perspectives on 32 bit vs 64 bit
On Fri, Sep 30, 2005 at 04:56:41PM -0400, Brett Viren wrote:
> lsorense@csclub.uwaterloo.ca (Lennart Sorensen) writes:
>
> > A 64bit application has 64bit memory pointers,
>
> I thought opteron memory was less than 64 bit wide. I'm remembering
> reading somewhere (here?) it was 40 bits.
Current opteron's may have that as a physical limit on address pins.
The architecture supports 64bit memory space because it has 64bit
pointers, and future opterons are certainly going to have memory
controllers that can go past 40 or 48bit or whatever the current limit
is. Software has no need to know about this limit since to the user
software it all just looks like memory somewhere in a 64bit memory
space.
> > so it can address much more than 4GB of memory.
>
> True in either case.
Len Sorensen
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