The main difference between AMD and Intel processors are that AMD processors have a 10 step execution process which doesn't allow as fast of a clock but AMD's counter that by being able to do more operations per clock cycle. Intls on the other hand have a 20 step execution proccess which allows much higher clock speeds but they have fewer operations per clock. That's why a 2.08 Ghz AMD barton can perform at levels like a 2.8 GHz Pentium 4. Another difference between the processors are the sockets they use. AMD's generally use Socket A (462 pins) while Intel generally uses Socket 478 (478 pins). Other differences include supported chip sets, AMD motherboards generally use SIS, VIA, or N force chip sets while Intel motherboards use Intel, SIS, and most recently ATI chip sets. AMD is a favorite for over clockers because with minor modifications the FSB multiplier can be unlocked while Intel multipliers cannot be unlocked (Not to say that AMD is used exclusively by over clockers, because it is not, but this ability to be unlocked is a plus). Also as of now Intel processors have the largest L3 cache at 2mb while the largest for AMD is 1mb.