I only used the 4130T to lower the overall power draw of the system since the PSU isn't great and I wanted to reduce the risk of overloading it. I read pcper's
An upgrade story and in one of their tests they ran a GTX 750 ti (60W TDP) + an i5 4440 (84W TDP) on a 300W PSU and that seemed to work fine. In my hypothetical build, it would be a GTX 960 (120W TDP) and an i3 4130T (35W TDP) with a 480W PSU. Only an 11W higher TDP compared to their build, and under gaming load their's used ~120W, so I would have thought my hypothetical build would not use too much more, although I dunno if it quite works like that.
Fortunately it's not a build I'm really thinking of getting, but I was just curious how strong of a GPU could be crammed into a budget PC for the same price (no rebates) as the $450 for the Alienware Alpha and still have the build actually work.