Question I7 8086K unstable at 4.6 GHz
Question I7 8086K unstable at 4.6 GHz
I attempted to increase the CPU frequency to 4.3 GHz while maintaining temperatures below 60 degrees and a voltage of approximately 1.15 V. It seems AVX is enabled by default in the BIOS.
I attempted to push the clock speed to 4.9 GHz using AVX disabled and a voltage of 1.3 V. After about 30 seconds of operation (temperature near 74°C), the frequency returned to 4.4 GHz.
AVX/2 generates significant heat on a CPU, similar to operating it at 130% during stress tests. Most games don’t rely heavily on AVX, making it a specialized instruction set found in certain professional applications. For accurate temperature measurements, Prime95 v26.6 small fft is recommended, as it simulates a full workload closely. It doesn’t utilize AVX and newer versions than 26.6 are not suitable for such tests. For stability and stress evaluation, Asus RealBench is the preferred tool.
The heat from AVX and related instruction sets has led BIOS to include an AVX offset. In normal everyday use, this offset typically ranges between -2 and -3 (200 or 300MHz). When the CPU detects AVX usage, it automatically reduces the clock speed by that amount. For example, a 5.0GHz processor with an offset of -2 would drop to approximately 4.8GHz under AVX conditions, along with a corresponding decrease in VCore voltage. This adjustment can cause instability at high clock speeds, which is why most systems disable the offset (set to 0) since it mainly affects gaming performance.
4.9GHz and 1.18v seem a bit weak, most users are aiming for 1.3v at 5.0GHz, 1.35v for 5.2GHz. For stable OC at that frequency, aim between 1.25v and 1.3v. View: https://www.reddit.com/r/intel/comments/...and_8086k/
I believe the issue might be related to the frequency setting. Changing it from "fixed" to "dynamic" could be the cause. I wonder if adjusting the voltage for such a high frequency would affect things? My computer kept looping in infinite bluescreen.
Also, I had to reset the BIOS to its default settings.