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I dont mind stretching an extra £20-£30 if its worth it. I see i can get an 480 for that.
Is this a better option than the 6950?
Really a trade off. GTX 480 is more powerful and will overclock further. There are not guarantees that the 6950 will unlock to 6970. IMO better drivers from NVIDIA. The 480 is more power hungry and will run hotter and therefore louder. Might be worth checking out reviews of particular games you play and see how they fare against each other.