For hardcore overclockers, the 2.4C SL6Z3 is a good choice. But, with PC3500 RAM using CH-5 chips, the 2.6C might be a better choice. The CH-5 RAM don't like the super high FSB as much as BH-5 does. Also, I think the Asus P4C800 is a little more tolerant of RAM with CH-5 chips (even though I personally prefer Abit).