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lol q9550.
That would hold back a 4870.
If your getting the same performance with a 7790 and a rx480 I would imagine there is something else limiting your performance.
Can't you overclock it?
My cpu is 7 years old and if I have to go back to stock or accidentally go back to stock there's a huge hit in games.
Unfortunately your system is now past it's best. Time for an upgrade or a serious overclock. Even with an overclock your system will be the problem. Just about there myself but the I7 920 was a seriously good chip.