the ncix one i think is the one u wud wanna get because it at least shows u the default voltage, which, iirc is the lowest one u can get on a mobile athlon. the FSB doesnt really matter as its a matter of your motherboard's overclocking capability anyway and the CPU itself cudnt care less. since one has a lower default voltage, that one is more promising in terms of overclocking (im assuming thats why u wanna get a mobile in the first place)