[CentOS] clock goes MUCH faster than normal on dual-core (solution)

Just in case anyone else gets bitten, I noticed that a bunch of my dual 
core opteron machines were losing time sync pretty fast (gaining a few 
days every few days...heh).  I searched back on the list and found some 
messages about passing a clock parameter in grub.conf.  The following 
worked for me:

clock=pmtmr

These are systems using the Supermicro H8SLL-i boards and Opteron 
175-185 cpus and running CentOS 4.3.

Cheers,