Does anybody have a recommendation for a benchmarking suite that in app shows where your bottlenecks are?

eg as simple as CPU utilization, GPU utilization, RAM speed utilization?

It uses CPU performance counters to show things like ITLB_Misses or MEM_Bandwidth. It won't show when you're waiting for GPU/SSD/etc because those aren't visible from CPU performance counters. I'm not aware of a single tool that will do everything, unfortunately.

Also, this isn't a "benchmarking suite"; it's a tool you can use to instrument whatever load you're running, which I'd say is better. It's often used to improve software but could also identify if faster RAM will help.