There's really no argument to be had: the GeForce GTX 1080 Ti is the fastest graphics card on the planet under a thousand dollars. Folks who really want to push it to the limit are going to stick it under water—or better yet, liquid nitrogen. For the rest of us who want to push it near the limit, MSI and Corsair have created the GeForce GTX 1080 Ti Sea Hawk and its Sea Hawk X variation.
If you're a regular reader, you've probably seen the Sea Hawk cards before. These offerings blend a fairly traditional blower-style air cooler with a customized version of Corsair's H55 all-in-one cooler. In fact, Corsair also sells some of the same cards as "Corsair Hydro GFX."
So, to the surprise of no-one, MSI and Corsair are teaming up again to put the GP102 GPU of the GeForce GTX 1080 Ti under water. Even if you're not super-enthusiastic about overclocking, consider that the Sea Hawk cards should run pretty quiet. Plus, the GP102 is an absolutely massive processor, so beefy cooling will help it boost as far as card's power delivery hardware will allow.
The GeForce GTX 1080 Ti Sea Hawk X will be the faster of the two cards. MSI's product page puts it at 1569 MHz base clock and 1683 MHz boost clock while in OC mode. That's an 89 MHz bump to the base clock and 101 MHz to the boost clock when compared to the reference design. The non-X variant of the card "only" hits 1506 MHz base and 1620 MHz boost clocks, although the standard GPU Boost 3.0 disclaimer applies.
The Sea Hawk and Sea Hawk X also restore the DVI-D port that was absent on the reference model. Besides that, they appear to be similar to the reference cards. Both cards take one 8-pin and one 6-pin power connector. MSI hasn't announced pricing or availability for the GeForce GTX 1080 Ti Sea Hawk series yet.