You mean like when it says 800/1066/1333 support?
You have to understand companies in the computer business look for anyway they can to say things that other companies products have not yet. Not becuase the ones that don't say something such as "vista certified" won't actually frickin work in vista it's just that it attracts the lesser informed people to buy that thinking thats what they need. The same holds true for motherboards. Actually any motherboards that can handle 1333 FSB will handle 800 and 1066 as well. it's just that some don't say that on the specs that they also support lower and it may steer some lesser informed who have an 800 FSB chip away. This way some companies be sure to put that it supports all 3 or at least 2 of them becuase it really does, not that the other one that only listed 1333 doesn't as well. I know that was confusing but i hoped it helped.