As we mentioned earlier, for this reason, we can't make a direct comparison - that would be between the Core i5-9600K and Core i5-8600K, which we'll hopefully do soon. The impact of solder was fairly evident, though, with our CPU sitting at 5GHz being a few degrees cooler than our Core i7-8700K at the same settings, ie in the region of 80-85☌, despite the fact there are two additional cores present. This required a vcore of 1.26V, but even 1.35V couldn't get 5.1GHz stable, with temperatures skyrocketing past 90☌ too and we've heard similar stories from two other Core i9-9900K owners. Being the same 14nm++ lithography and Coffee Lake architecture, we should have seen this coming, but 5GHz proved to be the limit as far as liquid-cooled overclocking goes, at least with an all-in-one liquid cooler. A decent overclock is important too being a K-series CPU. ![]() The Core i9-9900K's success does depend on those high frequencies to maintain its advantage over AMD here and to make sure it's not losing ground to existing Intel CPUs, namely the Core i7-8700K and Core i7-8086K.
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