CPU temperature goes to 70C for about 2 minutes after start-up then back to 25C? Corsair H45 Liquid Cooler. Fans are very loud for the first 2 minutes, then after 2 minutes, the temperature plummets and fans go quiet. during this time I see CPU load go to about 50% at times, and I see large jumps from 55C to 68C then back to 56C and such. Other components are fine, at normal temperatures during startup. During normal operation, temperature hardly goes beyond 40C, even when gaming. Also, I have noticed it only happens for the first start-up of the day, if I turn the PC off and back on again it boots straight to 25C.