Mine can boot at 2.4 GHz, but it's anything but stable. Moreover, I had to have the voltage at 1.775v, and if I wanted it to be stable, I'd probably have to hit 1.8v. Not something I want at all.
It's running stable now at 1.6v, 133MHz FSB: 2.133 GHz. It's a setup most people are comfortable with. Some set their system at 132 MHz FSB to have the fsb:memory running at 2:3, which is limited to speeds under 133 MHz FSB, from what I've heard, so that the memory can be overclocked. Supposedly, at the 2:3 ratio, you won't get that kind of memory overclock unless you hit a much higher FSB than most, or all, CPUs can handle. From my calculations, that FSB is 198 MHz, but that just seems a bit high. If it is correct then you'd better have some damn good memory.
My point is, either be ready for disappointment (many people say that 2.133 GHz @ 133 MHz FSB w/ default voltage is a guarantee, but believe me, it really isn't), or be ready to have different chips to try out. Some people got really lucky, I recall this one chap getting his processor to run at like 180 MHz FSB or something with a 1.8v setting. However, overclocking is not an exact science, and that chip, although most often highly overclockable, might run into problems. From what I've seen, it's rarely -if never- cooling problems, too. It's usually voltage or motherboard, and barring that, the chip itself. There is a limit to how far you can push any chip.