Hi there guys & gals, I am looking at a Gpu to replace my ageing 4870. i saw an offer on an HD7770 and thought i would look at the comparison between the two. I must say from what i could gather from the results i wont see too much benefit from going to a 7770 despite the 3 gen gap. I know like for like i should be looking at an HD7870 but i can quite stretch that far. Would a HD7850 be a better option. I game at 1920 x 1080 on a 40" tv if that helps. am also open to nvidia suggestions but have been with ATI/AMD for so long not gone green although it would look nice in my case.