The game runs single core.
https://www.cpubenchmark.net/singleThread.html
The highest ranking of an AMD chip is rank 84 in single thread performance.
AMD is great NEW, but most people spring for older Xeons (I'm going to assume he's using Dual Socket Xeon 2695v2's), which are about $200/ea, because they'll still trump an AMD chip for a lot cheaper.