Question about ASUS Rog Strix Z370-E Gaming

I have a Noctua NH-D15 in use with the I7-8700k, which is overclocked to 5Ghz. Temperatures in the stress test with Intel Extreme Utility between 57°C - 84°C. The cooler is audible at full load, otherwise not at all. Had to place the second active cooler a little higher on the radiator so that the RAM has room. The two CPU active coolers from Noctua, including the active cooler on the back of the case, are arranged linearly. In my opinion, the airflow including the front cooler is optimal.

In this price range, I would recommend a water cooling system such as the Corsair H100i.