Those CPUs should be fine with a 4 pin connector. The 4-pin connector is fine with up to about 125-150W on the CPU and the eight-pin connector is fine for double that, but Ivy Bridge CPUs, even when overclocked, probably aren't going to break 150W or so unless you really crank up the voltage (if even then). It might be a minor issue, but I doubt it. However, unless you already have that board, I recommend getting a different one anyway. Intel boards are generally kinda basic in my experience.