Yeah, I think the full turbo boost occurs if all but one core is disabled. The next best turbo boost happens when all but two cores are disabled, at least that's generally what I've heard.
Definitely stick with getting a dedicated GPU as an upgrade. I'm still running at stock clocks over here on my 2500K, even though I've got water cooling and a Z68 mobo. I'm gonna OC later, once I rip some of my more demanding games. For now though, I'm doing great, and I imagine you'd do just fine yourself without having to OC. If you want SMG on LLE, then yeah, you'd need to OC, but otherwise you're good for a vast majority of the games Dolphin plays.
Definitely stick with getting a dedicated GPU as an upgrade. I'm still running at stock clocks over here on my 2500K, even though I've got water cooling and a Z68 mobo. I'm gonna OC later, once I rip some of my more demanding games. For now though, I'm doing great, and I imagine you'd do just fine yourself without having to OC. If you want SMG on LLE, then yeah, you'd need to OC, but otherwise you're good for a vast majority of the games Dolphin plays.