Nah.. he's mistaken.. SL6RZ 2.4b is an Intel P4 processor.. not AMD
I haven't seen many results on the 2400+, but I think people are able to hit at least 2.2-2.4 GHz on average from the stock 2 GHz speed of the 2400+.. This is just my best guess this late at night.. I'm sure someone else out there has more accurate reports