I'd say no measurable difference, the contacts don't really enter into the equation, trace length might have a minimal impact.

If so, I'd put my money on the PGA having a bit more efficient pathway from MoBo to core.

It'd be difficult to come up with any difference, but having the system clock oscillator off within tolerances one way or the other would be of far greater impact. That alone would keep any two MoBos from performing identically. Test half a dozen crystals of the "same" frequency in one board and I'll bet you'll see measurable variances.

How many angels can dance on the top of a 68030? [)] ]'>