Much as I love OSX - purely to run Unreal (everything else runs fine on my 2011 iMac) it makes more sense to me to spend £1000 on a Gaming PC with a GTX770 in it that will definitely (?) work at a decent frame rate, than to spend £1600 on a new iMac that might work, or indeed £2500 on a Mac Pro that might work. I can even justify it in immediate saving (forgetting potential 5%) on a £2000 Unity licence. And perhaps I might grow to like Windows again. It’s depressing that Mac doesn’t have power needed though.