I agree with Toss5000. 1 MHz AXP overclock is not equal to 1 MHz P4 overclock. AXP 2400+ can overclock 400 MHz more than stock, which is not worse caompared to P4 2.4 GHz.
Moreover, you can unlock multipliers of a AXP. With P4, its impossible. Multiplier lock free cpu is always better compared to locked multiplier CPU's. Regarding this fact, AXP 2400+ is better cpu for overclockers compared to P4 2.4 GHz.
Just to add something, 2.4 GHz overclock with an Athlon (even the T-bred B) isn't exactly too common. Some sites have been able to do it on high-end air and people have reported it on forums, but looking at the overclockers.com database, only 2 people out of 25 have gotten their "2400+" over 2.4 and that's with 2.05 V core (not recommended for a .13 micron chip). In fact, it looks like most of the results had extremely high vcores. All the ones under 1.9 vcore hit 2.2ish GHz which would be equivalent on average to a 2.7ish P4.
"We are Microsoft, resistance is futile." - Bill Gates, 2015.