Since you're running ASUS overclocked cards, you'll also want to get ASUS GPUTweak II, not so much for the overclocking, but for turning the fans to a very aggressive state. The default setting is very conservative and will let the GPU reach much too close to its upper heat range before playing catch-up:
Simple but BEAST Status - New Gaming PC Build 2016 - Core i7 6850k - GTX 1080ti (x2) SLI - 7680x1440 - M.2 SSD - 8TB (UPDATE: Upgraded cards to Ti's) Page 5
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With your build, 3DMARK with FireStrike Extreme.
https://www.futuremark.com/support/downloads
Since you're running ASUS overclocked cards, you'll also want to get ASUS GPUTweak II, not so much for the overclocking, but for turning the fans to a very aggressive state. The default setting is very conservative and will let the GPU reach much too close to its upper heat range before playing catch-up:
https://www.asus.com/us/site/graphics-cards/gpu-tweak-ii/download/GPUTweak2_Ver1452.zip