Randall R Schulz wrote:
On Tuesday 30 October 2007 14:24, Patrick Shanahan wrote:
...
again, perception, not fact as Jan has noted.
Jan's points have little to do with mine. Move twice as much data to
perform a given task with the same bus and memory hardware will take
twice as long.
My points had nothing whatsoever to do with "perception." They are an
accurate and valid analysis of 32-bit vs. 64-bit data (and pointer)
architecture disparities.
Especially since currently, memory modules are still
only 32 bits wide...motherboard manufacturers are at
liberty to make the external data bus either 32 bits
or 64 bits wide.
If your motherboard allows you to
A) To install pairs of memory modules, of differing
size, (say 512 MB and 1 GB) and to use ALL of
the memory (1.5 GB instead of only 1 GB)
or
B) install odd numbers (1, 3, 5...) of memory modules,
then your IA-64 or AMD-64motherboard's data bus is
only 32 bits wide, killing most of the speed advantage
of a 64-bit processor, and really only giving you
the benefit of an address space beyond 32 bits.
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