Will Corsair Hydro Series H115i work with Cooler Master HAF X?
You might check the Corsair website on this, because they maintain a compatibility list for the cooler. Whether the list contains information about cases of other makes, I can't recall.
I have three HAF 932 midtowers. The HAF X fulltower apparently has top-panel vents designed for (possibly) twin 200mm fans as well as a pair of 140's. That configuration is second-best, as the cooler gets intake from internal case air, and exhausts it. But as much as we've had discussions and disagreements about this, it's not likely to make much difference in a well-ventilated HAF case, especially if most of the other (and 200mm) fans are used for intake.
If the mounting points and holes don't match up to the H115i, you might have to make some minor mods to the case. But I'm inclined to think the cooler will fit at the case top-panel. Whether there is room for quadruple fan application of "push-pull," that's something you would need to find out.
Whether the cooler will fit in the case front-panel, I wouldn't know for sure.