I have an i5 9600k and I tried to overclock it. It was my first time so I tried 5 GHz but wasn't stable so went down to around 4.9 GHz with 1.36v. I have a Coolermaster 120mm liquid cooler running at full speed. But I am getting around 77c during the cinebench test and about 45c at idle. Is it normal? Also, can someone help me with overclocking to 5ghz? I heard that it is possible but, I don't know why it is unstable or will it be ok to stop here?