I have a late 2011 iMac with thunderbolt on it, that isn't the issue. I'm just trying to build my own device to use with Thunderbolt (I believe it is just plug and play, no need to code drivers or anything) and I can't find a female port to use as my output (connected via the male-male cable sold by apple).
I'm just tinkering around to be completely honest but I built a small pci-e enclosure with a dedicated 300 watt powersupply and I have a gtx 560 graphics card in it right now. Since Thunderbolt is capable of faster transfer speeds than pci express (10gbitI/10gbit0 I believe) I am attempting to hook up a graphics card externally to my iMac.
This is more out of curiosity and my natural instinct to take things apart and put them back together than an actual need for a better gpu.
edit: and why exactly did my original post get voted down? i searched the forum and couldn't find an answer so i made a thread about it.