rrod is caused by the chips getting too hot, mainly from their very poor aplication of thermal paste. microsoft have now put in smaller chips, meaning less heat and new heatsinks. still wont fix it though as its down to how they paste it up and the way they hold the heatsinks on. as for the bolt and washer xclamp fix, it will fix 90% of rrod's. make sure you use as5 (arctic silver 5) and that the chips are mirror shiney anyone needs help let me know, ive done loads of rrod repairs for my site