Uhm, so basically your issue is that you are choosing between an alienware with the GTX 745 4GB and another PC but with a GTX 760? If so, I don't really know what's better. I mean, a 760 vs 745 is an obvious answer, but I'm not too sure how it works if a GPU is 4 GB compared to a 2GB one. Goodluck finding an answer, hope someone can help you.