^like said above, the 480 is still a fairly powerful card for being as old as it is. no doubt it runs hotter and definitely consumes much more power, but it is still faster than the 750ti. you would be better off with a gtx660 or an r9-270 as they would be able to actually give you a bump in speed. but for now you should just wait a few months longer so nvidia can fully release its gtx 800 series and there will likely be an 800 series that compares to the gtx760 at a very nice price point.
what cpu do you have?