![]() In the first two charts, we can see both the Corsair H115i and the Noctua NH-D15 handle the workload with no throttling (the downward spikes occur during idle periods between runs), and temps hover in the 85C range when the processor is under full load. First, we kicked off ten multi-threaded Cinebench R20 benchmarks in rapid succession. Here we ran two series of tests to measure power consumption, thermal output, and clock rates during heavy real-world all-core loads. In fact, we often don't include Prime95 power measurements in our standard CPU reviews, largely because there is a massive disconnect between this extremely rigorous stress test and the power consumption and thermal load generated by most real-world applications, as we'll show below. Those workloads include stressful multi-threaded applications like Blender and AVX-powered HandBrake distributions. There's a stark difference between the power consumed during stress testing applications that serve as a power virus, like the Prime95 test we ran above, and the power consumption you'll see during everyday use with the majority of 'normal' applications. It's surprising to see the sheer amount of power consumed (and heat generated) by the Core i9-10900K, but it's important to keep perspective. At times, they also remained at 5.0 GHz when the core reached 100C, too, albeit for very short periods. That's right at the Intel-specified temperature limit. In fact, even though we're only showing the highest measurement from each of the eight cores, our logs indicate that individual cores still boosted to 4.9 GHz even when they were at 99C. It's noteworthy that Intel positions its all-core 4.9 GHz frequency as a new Thermal Velocity Boost that only engages if the processor is below 70C, but as we can see here, the motherboard completely ignores that temperature limit. Naturally, the air cooled configuration suffered more. Meanwhile, the frequencies (left axis) of the hottest cores dropped from the all-core 4.9 GHz down to 4.7 or 4.8 GHz as the processor engaged its throttling mechanisms to protect itself. As you can see in our chart above, which measures the maximum frequency and temperature from any given core at a per-second granularity (100ms polling), temperatures (thick red line, right axis) quickly accelerated to 100C during the Prime95 test, and stayed there.
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