If you can return that 550ti. Trust me, you will be pissed off because you will not get a $130 performance boost. Your boost will be maybe 10%. That might sound like a lot, but realize that is the difference between 30 and 33 fps. It is only one tier higher on tomshardware's hierarchy and most people recommend at least 3 tiers higher. The cheapest card you could get is a 470, but I would recommend you try to get a 7850.