Pondering whether to sell my 2 470gtx's and get a single card from a newer generation. Main reasons really are heat generated, power usage and.....well....they are a couple of gens old now. I have a i7 920 @ stock and 6gb ram @ 1600mhz. I game at 1680x1050. Looking at spending £250ish depending on what I would get for the 470s. So...is it worth the hassle, is It a viable upgrade looking at price/performance gain?