Benchmarking an Rstats workstation on realistic workloads - using xgboost via h2o

Why? I recently built out a new workstation to give me some local compute for data science workloads. Now that I have local access to both a CPU with a large number of cores (Threadripper 1950X with 16 cores) and a moderately powerful GPU (Nvidia RTX 2070), I’m interested in knowing when it is best to use CPU vs. GPU for some of the tasks that I commonly do.