Power Usage and Temperatures
My last few tests are what I consider some of the most important. That is because no matter how fast a CPU is, if it requires your own power plant to run or runs extremely hot it might not work in your build. If nothing else it is important to know what you need to plan for your case, cooling, and power supply.
I start with power usage. I ran two sets of tests, both using the Kill-A-Watt to measure the wattage at the plug for our test system. The first test is our older test where I use wPrime to load the CPU and the second is our new test that uses the AIDA64 FPU stress test to put even more of a load on the CPU. In the wPrime test, the 8086K and the rest of our test system pulled 161 watts at peak. When running at idle it pulled 49.4 watts. Now, this wasn’t as bad as the high core count Core-X CPUs from Intel as well as the fastest of the Ryzen 8 core CPUs with the 1800X and 2700X. It was however much higher than the 8700K. In the AIDA64 test, the 8086K pulled 200 watts, coming in just below the 1800X and 20 watts above the 8700K.
Now the temperature testing, that was also done using AIDA64’s FPU stress test the 8086K was really pushing the limit on the Noctua NH-U12S cooler that we use for all CPU testing. At 79 degrees it was 7 degrees higher than the already hot 8700K and well above all of the Ryzen CPUs that it is competing with. It’s clear those increased clocks really push the limits of the cheaper thermal interface material, this isn’t a huge shock because it was an issue on the 8700K and the 8086K with its higher clocks is only going to be affected even more by it. Now given that the 8086K is binned higher than the 8700K it is known to be a better overclocker when delidded. Check out der8auer reaching 7244 MHz back in June.