Citation :
Starting with the Color Grading results with a single RTX 2080 Ti, you can really clearly see that while you need to have enough CPU power to keep up with your GPU(s), there isn't much benefit to having more CPU power than you need. In fact, all the AMD Threadripper CPUs and all the Intel X-series CPU (with the exception of the i7 9800X) pretty much performed the same. So, if you wanted to get the full performance out of your RTX 2080 Ti, as long as you simply use an Intel X-series i9 or AMD Threadripper CPU, you should be just fine.
If those CPUs are outside your budget, the Intel 9th Gen CPUs also did pretty well, although at this level the AMD Ryzen 2700X is likely a better choice since it is typically priced closer to the i5 9600K while being ~30% faster for color grading in Resolve.
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