andrewman447,
Q - What is your ambient temperature?
Q - Which version of Prime95?
Do not use versions of Prime95
later than 26.6. Recent versions such as
28.9 run AVX code on the CPU's Floating Point Unit (FPU) which causes
unrealistic temperatures up to 20°C higher. The FPU test in the utility AIDA64 shows similar results.
Here's the recommended operating range for Core temperature:
80°C
Hot (100% Load)
75°C
Warm
70°C
Warm (Heavy Load)
60°C
Norm
50°C
Norm (Medium Load)
40°C
Norm
30°C
Cool (Idle)
25°C
Cool
Intel's specification for Digital Thermal Sensor (DTS) accuracy is +/- 5°C. This means deviations between the highest and lowest Cores can be up to 10°C. Since yours is 11°C, it's out of spec. If your TIM is indeed properly applied, then an 11°C deviation at 100% workload typically means that the TIM between the Die and Integrated Heat Spreader (IHS) is flawed from the factory. Can you still RMA?
andrewman447 :
I'll be in a game and out of nowhere it will spike to like 88C.
Intel’s specification for DTS response time is 256 milliseconds, or about 1/4th of a second. Since Windows has dozens of Processes and Services running in the background, it’s
normal to see rapid and random Core temperature “spikes” or fluctuations, especially during the first few minutes after startup. Excessive spiking is often caused by unnecessary tray startup services which consume CPU cycles and memory resources.
6th and 7th Generation processors have "Speed Shift" technology, which is more responsive to changes in workload than "SpeedStep" used on 4th Generation and previous processors. Speed Shift is internally controlled by the CPU, whereas SpeedStep is controlled by the Operating System. Speed Shift is more energy efficient as it has more clock and voltage levels, but produces more pronounced temperature spikes than SpeedStep.
Core temperature spiking is not caused by TIM. However, the better the TIM and cooler, and the lower the Core temperatures, the less pronounced the spiking. These figures from Silicon Lottery - https://siliconlottery.com/collections/all/products/del... - will give you an idea of just how poorly Intel's TIM really performs:
"Temperature improvements vary depending on processor sample and architecture. Temperatures under an overclocked load (1.3V-1.4V) will decrease anywhere from 5° to 25°C. Typical temperature improvements are listed below:"
Ivy Bridge - 10°C to 25°C
Haswell - 10°C to 25°C
Devil's Canyon - 7°C to 15°C
Broadwell - 8°C to 18°C
Skylake - 8°C to 18°C
Kaby Lake - 12° to 25°C
Just to help put Core temperatures into perspective, I'm running a de-lidded 7700K on a Cooler Master TPC 812, which a large single tower air cooler with push-pull fans curved to reach 100% RPM at 70°C. The TIM between the Die and IHS is Cool Laboratory Liquid Ultra, and the TIM between the IHS and cooler is Arctic MX-4. I'm overclocked to 5.0 GHz at 1.373 Vcore in CPU-Z with Prime95 version 26.6 Small FFT's. I have no need for liquid cooling as my hottest Core is 73°C at 22°C ambient temperature in a modified Antec 902 v3 case with impeccable cable management.
CT
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