Welcome to the forum!
First of all, if you want to game 8GB is totally useless. Unless you want to do do VM or cad or thing like that. Stick to 4GB it's far enough. I can't tell you how much FPS but your game should be good on that with a good CPU so the 970 can fit the bill. That + a good 890 mobo will be just what you need:)
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