VNU.net: "The problem is that x86 systems have typically managed memory in
4Kb pages, but when the Pentium processor was introduced Intel
added a feature called extended paging which allowed 4Mb pages
to be used instead.
The Linux 2.4 kernel automatically takes advantage of extended
paging by running Pentium specific instructions. The result is that
Athlon and Duron processors experience memory corruption when
using AGP video."
January 21, 2002