Wild CPU temperature fluctuations during stress test
Your cooling system is unable to adequately cool your CPU
The processor should not reach 95 °C even under load and ideally should be operating below 90 °C. The processor will throttle automatically when its operating temperature is too high, then return to normal when temperatures drop to safe levels. This behavior explains the fluctuations in clock multiplier and temperature.
Make sure you've properly installed the heatsink and fan and that you've properly applied the thermal paste. If this does not help, it is likely that your laptop's cooling system just doesn't have enough capacity to keep up with your upgraded processor's heat output.