you know what they say about durons, it might be a rumor but, they are supposibly athlons that werent stable at higher speeds so they underclock them label the durons and sell em out to you so what ever speed they were before will depend on how high they go thats why no one posts the same, hell i heard of 1 guy getting 1.2 out of a 600, but yet there is this one guy who only got 750mhz out of it its all up to luck, and i hear that the higher ones clock about the same as the 600.........