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How fast is your cpu and what games are you playing the most?
Look at my setup. I believe we are close in power but I have CFX. I can tell you it is great at 1080p but for newer games such as BF4, Metro, Crysis 3, (maybe Assassin's Creed), my system will be slow on Ultra settings.
But other games, I can still game fairly well just by turning down AA (my default is 8xAA) or using FXAA/SMAA instead such as in ARMA 2, DayZ, and ARMA 3, SVENCOOP (yes, I love HL1 series), Brutal Doom, and etc...
The best thing test for you is play your favorite game on MAX settings and see if it is fluid enough. When it starts becoming more of pain to play games, that is the best time to upgrade instead of impulse upgrading. You will so appreciate your new system more.
For me, I am really waiting for 4K gaming before I upgrade. Maybe Christmas or next year but for sure, by Christmas 2015.