Watercooling CPU Temps

[restie]

So I have a Ryzen 7 1700 overclocked to 3.9GHz
I have a DeepCool Captain 360EX AIO Liquid cooling.

At full load, and full fan speed (~1800rpm) my cpu temp is 63c
when I turn the speed down to (~800rpm) my cpu only goes up to 67c

My first time using AIO liquid cooling. I was expecting a bit more difference between full speed and low speed. Is this normal?

 

[HybridWolf]

Assuming that you have fans installed in the radiator of the water-cooler, the less the RPM The slower the fans are, not allowing the water to stay cool which is circulating around the CPU, I think you could push that CPU Up to 4 Ghz with that cooler, but it may be unstable, and those temps for reducing fan speed by 1000 RPM Is pretty sweet.