It runs on CryEngine 3....
Roberts says the video in the trailer was captured using an Nvidia GeForce GTX 670, which, by the time Star Citizen arrives, will be a two-year-old videocard. I saw a very early version of Star Citizen running live on a Dell gaming laptop, and it looks absolutely astonishing -- particularly in the high-polygon ship models and lighting departments. This is what a high-end game built strictly for PC hardware in mind looks like.
doesn't matter if it uses CE3, you can optimize it down. I think it will be fine, as they said its at least 2 years away and if you can't run it by then, then you should stay a console buddy.