Dual Core TB runs at 2.4 Ghz on the 720qm, and forcing it in dolphin (locking threads to cores) actually yielded worse performance than the default where presumably Windows manages all the cores/threads at lower clocks. Admittedly, I only tested it once or twice, and this was older builds that could have possibly been broken, but that was my experience. In general though, regardless of settings, it wouldn't run anything in Dolphin at full speed except 2D fare like Muramasa and NSMB. I'm not sure what kind of strides they've made in OpenCL since then, I quit trying around the 5600 or 5800 builds.