With the cheap H100i (80 dollars), 3.8 Ghz. I tested h100i at stock clocks in OCCT. Highest temp was 45ish C. Fans on radiator didn't even spin up. At 3.8 Ghz the temp reaches 70 C and fans are loud. I have quite an aggressive fan curve. In normal use, I never see temps over 55 C.
Never even installed stock cooler.