Well considering the AMD64 3500+ is 2.2GHz what are the chances that a 3300+ (which I can't even seem to find online) is 2.4GHz?
It tells you the FSB on the package. Go into the BIOS, look for CPU FSB, and if it's lower than 200 then theres your problem, because all AMD64's should be at 200FSB or 'HTT' since FSB is technically referring to older Socket A systems.