> > > The MMX memcpy for CyrixIII and Athlon boxes is something like twice the
> > > speed of rep movs. On most pentium II/III boxes the fast paths for rep movs
> > > and for MMX are the same speed
> > As long as you are copying in real memory. So the PCI bus or the host bridge
> > implementation may be the actual limit.
> The CyrixIII sits on the same host bridges as the intel processors
I don't know if it applies to this case but one thing I have seen make
a noticeable difference is whether or not write-combining is enabled.
If we have only be enabling MTRR's for intel this could do account
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