Hi,i cant decide between the two.i have a 4k screen so i want the best berformance i can get,should i go for one 1080 or two 1070s?i have just enough money for 2 1070 right now so idk.the rest of my pc is i7 4770k,16gb ram,800w psu.also would the cpu bottleneck these new cards?i previously had 970 sli wich were pretty good only a handfull of game didnt had sli profiles or good scaling.so im thinking id want some more performance compared to the 970s that i sold to my friend.the 1080 is kinda faster with like 10 fps idk the performance of 1070s sli couldnt find anything on google but im thinking it should be better with them new sli bridges right?:/.thank you.