I have an i5 3570k cpu with an asus p8z77v-lk motherbard. I was previously using a gigabyte 7850 gpu and a corsair h60 water cooler. I used the bios ez mode optimal setting for a quick overclock because I knew I would be upgrading some components. They had base clock at 103.0 and a multiplier of 41 on all cores (so I was at 4.2 GHz). I ran prime95 small fft for around 8 hours and the highest temperature I received was around 78 C with no errors. The voltage was around 1-1.1V. I was pretty happy about this and was excited for what I would be able to achieve after the upgrades. I just switched out my 7850 for a r9 270x and my h60 for an h80i. I used the same overclocking settings to see how my new setup fared and was very disappointed. As soon as I started the prime95 test the temperature rose quickly to over 100 C. I immediately turned the test off. I then restored all the settings to the cpu defaults and tried the test again. I am now getting a max temp of 82 C but at a much lower speed of 3.6GHz. Voltage is at 1.016 V. Can anyone please tell me what is going on?