are you sure that the motherboard supports cxt core. The fact that it boots at 6X means nothing because it is detwermined by the cpu, not the motherboard. Perhaps there are a few k6-2 optimisations not being used because the bios has some dificulty identifying the chip. Goto amdzone forums and ask or goto tweakbase.com or a similiar site and get k6-2 optimisation programs. powertweak may be useful as well, the newest versions may implement the optimisationms i think. try that.