gtx 670 sli

Hi everyone, I'm starting my first Socket 2011 Hackintosh, having recently sold my 2010 i7 iMac, I have the ultimate aim of creating a build that'll last me past the Haswell Extreme Series (2-3 years time?). Thus far I've bought myself a 3930k, Sabertooth X79, Corsair HX750 and GTX 670 Twin...