So I'm planning on buying a graphics crad but I don't know which one to choose. The 6770 or the 7770.
My budget is £80 but I'm willing to up £20; I found 7770 for £100.
My opinion is spend the extra money on the 6850/6870 as they will on average out perform the 7770 for the same price. If power or heat is a worry for you, then you can't go wrong with the 7750/7770.