Thanks again for the references. The first two, although very interesting, don't really apply to the native P2B board. What I would like to do with this board, if possible, is to increase the vcore voltage a point or two. I have a Katmai PIII 450 in it right now, clocked at 112mhz (ie 504) and can't get it to fly at 133. I'm told that if I could increase the voltage I might get the necessary stability at 133; but nowhere have I been able to discover how to do this, short of covering processor contacts, which seems to be a very risky business.