After building systems (hobby) for a few years, I liked the looks of the dell xps420, when it came out and bought one. didn't take long before i realized (dell does not let you be an adult and oc) even with your own system. Have changed the psu 700w,4gigs ocz pc6400 800 mhz mem, bought a xfx 260 vc. I was wondering if by changing the mb with the q6600 will I be able to oc, or is the cpu itself locked? bought a second xfx260 vc, and was going to change my mb anyway for sli. is it worth it to keep the q6600 or replace both the cpu and mb? thanks in advance for help. Any suggestions 300-400 mb and cpu combo if needed