Wait for 1080ti or get another 1080
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Solved by PeachyUwUSenpai,
wait for 1080 ti or get a titan xp not sure if titan xp is more powerful than the 1080 ti though. sli is a bitch single card is generally better.
though as some one who also has a 1080 why do you need a more powerful one it runs all the current games on epic ussualy in 0 db mode .