I have seen no advantage that is detectable for the AMD 64X2 4200 over the AMD XP2800+ other than the temperature difference, which is significant though. The normal use temperature for the 64 is always less than 100�ºF (24�ºC) and usually about 93�ºF (20�ºC). The 2800 runs about 108�ºF (28�ºC). I still am amazed that the temperature is so low. That would make any heat aging virtually nil, since there would be no thermal-generated electro-migration of the metal leads. Is this temperature abnormally low? I must admit that I do no dynamic gaming on the 64X2 unit, but the other is even more docile. My wife uses the AMD 2800 32bit almost exclusively for Internet searches and board games.