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Tbh, what card will ever feel like a massive upgrade from now on (excluding waiting for 5+ years)? The jumps will all be low double digits from now on except for crazy expensive setups (Nvlink Titans etc). A 2080 for £544 is a very good deal.
I go up in increments of 50% when I upgrade my GPU. The 1080ti is 50% better than the 980ti.