I would just buy one and put it in there ,look there will be some bottlenecking but the rumoured RRP is meant to be 600 USD ,god dam thats 1070 money .Just go for it , check it out ,you can see how much bottlenecking you get and if you game play is not what you like Then upgrade ,your going to buy a 1080ti anyway so you can't lose ,trying it out ,And post the results ,I'm interested to see what happens ,If you don't know how to test bottlenecking just go to the many you tube videos testing it ,You can see CPU usage during games and benchmarks