Have to be very careful with water cooling. Water cooling does nothing to cool the VRMs on the Mobo, which gets very hot and is vital to the overall success of your overclocking project.
A good air cooler can be just as effective as any water coolers such as the H100i. For example, the $79.99 Cryorig R1 Ultimate is on par with the $114.99 H110 as shown in graph.
From https://www.techpowerup.com/reviews/CRYORIG/R1_Universal/6.html