It's this "new math", 533MHz=133MHz. Actually there is no such thing as a processor with a 533MHz bus, it's a lie. The lie is based on the fact that it runs on 133MHz actual clock rate and uses Quad Data Rate for 4 transfers per cycle.
AMD invented this lie with their Dual Data Rate "200MHz" bus which actually ran at 100MHz, and they were so sucessfull at promoting this like that Intel felt bound by marketing conditions to follow.
You can't change your CPU multiplier, and that's a GOOD thing. I have an "unlocked" CPU here that won't run above the motherboard's base multiplier on any board that doesn't have hardware multiple controll. Intel added this feature for ease of configuration, although overclockers would choose to believe otherwise.
So 20x133MHz is right. Your BIOS is giving you REAL data from a REAL clock generator, the clock generator producing 133 million cycles per second, aka 133MHz, in spite of the "QDR rate".
<font color=blue>Watts mean squat if you don't have quality!</font color=blue>