well the ram speed really doesnt play an issue in athlon overclocking unless you really start messing with the front side bus speeds and even then the athlon motherboards wont take huge fsb increases well. Couple things for overclocking, make sure you get a mobo that can either do the jumperless multiplier changing(abit kt7, asus a7v, msi k7t pro2) or has jumpers that you can set( i dont know any off hand or whether there are any even) then your biggest enemy is heat. YOu'll want good cooling for your case as well as a good heat sink fan combo to keep the cpu cool. Then its up to the cpu. Some cpu's overclock farther and with greater ease than others while some wont overclock much at all.