Somebody please jump in here and correct me if I'm wrong, but I don't
believe that it's the physical size of the cache that limits the amount of
cacheable memory, but rather the number of bits that the TAG chip can
address.  For instance, my Tyan Tomcat IVD motherboard has an HX chipset
with 512K of cache, but it is capable of caching much more than 64MB of RAM.

Drew Dunn
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> >According to my source, there is a little known limitation with current
> >Pentium II processors that allow them to recognize or address a limit of
> >64Megs of RAM. This despite the fact that many high-end Pentium IIs are
> >advertised as being expandable in the RAM department to much higher
> >amounts. Could this be a case where the Pentium II motherboards
> will accept
> >higher amounts of RAM, but somehow the excess over 64Megs is not
> recognized
> >by the CPU?
>

> What I do know, is that with 512K of L2 cache, only the first 64M of RAM
> will be cached.
> This has nothing to do with the CPU itself.  Motherboards with 1024K L2
> Cache have been
> coming on the market for at least 6 months any they will definately be the
> standard soon,
> since a lot of people are putting more than 64M in their system.