I have an alienware m17x, with an intel core i7 x920, and 2x ATI Mobility Radeon HD 4870s. The ventilation is totally sufficient to overlcock my cards. I tried using RivaTuner, but it only overclocks ONE of my graphics cards and not the other. I can't get it to clock both of them. Any ideas, suggestions, other programs I can use? I tried using MSI Afterburner; it failed. Every time I ran the program, my computer would instantly freeze. I tried reinstalling it multiple times, same problem keeps happening.