Currently I'm running a 2.4 GHz Core 2 Duo in a 20" iMac. I'm looking to buy a 15" MBP for university this summer, and I'm a little confused about the new CPUs. Now, I understand that Sandy Bridge is the latest CPU technology and that they're quad-core and all that, but aren't they running at a lower clock speed? Let's say, for example, that I'm running an app that requires 2.3 GHz to run smoothly: Won't the lower clock speed effect that? I don't mean to sound like a complete noob, but I've never really understood CPUs and the way it all works, so some clarification and reassurance that the new CPUs in the 2011 MBPs will scream performance-wise would be great here. Thanks.