440 BX.
chipzilla's famous
core logic chipset for
pentium-class
x86 CPU's.
It started at a
FSB clock of 66
MHz, and prolonged its life at 100 MHz; beating many newer chips. Rock-solid, fast (back in the days, at least) and stable. Nice for
overclocking.
The newer
i845 shows the most
potential of being the "the new BX" because it's said to be
stable and
fast.