I think they just do a quick heat/wattage calculation to see what the maximum cooling their heatsink can provide is.
INTEL REP: "hey dragon orb guys, you better design your heatsink to cool a 2ghz tually, cause were churning them out as we speak"
DRAGON ORB GUYS: "thanks for the heads up d00d"
~Matisaro~
"Friends don't let friends buy Pentiums"
~Tbird1.3@1.55~