I don’t know if any benchmark tool can be used to do the CPU performance comparison between Jetson AGX Xavier with Intel i7, i9, I only have below inference or video processing results as your reference, you also need to consider the balance between power comsumption and perforamce.
Not sure what’s your use case for “Should a PC-based system be installed and integrated with Jetson AGX Xavier?”, you may also refer to NVIDIA Clara AGX | NVIDIA Developer