What is the best CPU for Maya if I am GPU rendering?

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I am building a workstation for Maya. I am going to use Maya for modelling and animation, and Redshift for rendering. I will not be using Maya for simulations.
From what I have read online, GPU rendering with V-Ray or Redshift is faster than CPU rendering, so I am going with a 2080 ti as my GPU and avoid CPU rendering entirely. Here are benchmarks showing rendering speeds for GPUs:
But which CPU is best? Having a CPU with a lot of cores and lower clock speeds (Threadripper, Skylake) seems like a waste now. Since I am not CPU rendering, what other Maya functions requires consideration between high core counts and core clock speed? The only example I can only think of is view port performance. Is there anything else to consider?
The fastest single core CPU right now is the i9-9900K. But I cannot find any benchmarks comparing the i9-9900K to any other processors in Maya specviewperf benchmarks. The excellent Gamers Nexus article linked above uses an i9-7980EX as its test CPU with specviewperf benchmarks, but I have no idea how the i9-7980EX compares to the i9-9900K in terms of specviewperf because it was a GPU only comparison.
So this leaves me with some questions:
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Which CPU is best for Maya with GPU-only rendering? i9-9900K or i9-7980EX?
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Is there some other activity or function in Maya besides view port experience that might benefit from higher core counts over clock speed? Perhaps simulations, but I am not doing that.
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Which processor has the better view port experience? i9-9900K or i9-7980EX?
The CPU choice matters because their platforms have different amounts of PCIe lanes. If I go Skylake, I can add another GPU for rendering to the workstation without sacrificing PCI speeds. For example, an i9-9900K would limit me to one GPU with x16 PCI; two GPUs would put me at x8 PCI speeds for each GPU. So I would like to know what I am truly gaining in viewport performance (or anything else) with an i9-9900K when I give up having a second GPU for rendering that I could have both at x16 speeds if I go with a Skylake CPU.
TL:DR: What is the best CPU for Maya if I am GPU rendering?
Sorry for the long post and thank you for your help.