I am aiming to replicate Dschijn's 15 inch setup. He seems to be using the 2.5 ghz cpu, but it seems as though there's a big boost from the 2.5 ghz 4870 to the 2.8 ghz 4980 I think the same may be true for this year's 15 inch, so I'm wondering if I should splurge to upgrade all the way to the 2.8 ghz iris pro model for that extra physics score boost? Or will the CPU strain only a worry for the 13 inch MBP and lowering voltage as Dschijn does would take care of any demanding processor applications? I was also curious, offhand, what kind of weight this setup might have? I was mostly considering eGPU for portability versus a hackintosh, but it looks like they may end up weighing the same given the weight of the raven's case.