Anyone had any luck with this yet? Have Battlefront coming out next week and getting my system prepped. I haven't been able to get the amd catalyst software to let me do any overclocking though. I'm wondering is it just not possible with this graphics card? I've looked around online but couldn't find anyone who has but I don't blame them cuz it's a pretty new system. If anyones had any luck with overlocking a retina imac just let me know, thanks!