Depends on if this is a newer 2.4B or not. The later ones overclock quite well, often well over 3 gig. Even the older crappiest most stubborn ones usually will do at least 2.7 gig.
Let's just pretend the CPU is capable of doing 3 gig. That's 166 FSB. Using the 1:1 memory ratio results in DDR333. Oddly, that's exactly what PC2700 RAM is rated at.