PC133 and chipsets.... how?

[otheos]

One dumb question:

In the KT133 (or any other 100/133 MHz chipset mobo), you can set the FSB to be 100 or 133 and if you've got good memory it will work. But in the KT133 case, isn't this overclocking? (official)!

Or is the chipset setting to 100 or 133 mem bus by auto sensing the DIMMs (doubt it but..)?

In other words what do they mean "PC133 support"?

[Roy]

I don't know about other chipsets, but the 440BX is considered a "100". I've run mine at 155 without problems, and many users consider it to be a "133".