The reason I recommended 2 computers is that I did not have a core i7 (at that time) - and I had plenty of dual core and core i3 machines.
If you love using a mac (and I do), you will only be able to run x-plane natively on a mac. The simavio must run on windows. It is possible to install windows on a mac (dual boot mode using boot camp). Don’t try using a virtual machine (vmware etc) - you will need the mac to boot up into windows.
With the 2 mac dual cores, I could get 30 frames per second. It worked well enough.
Before going in to do a real simulator ride (for an IPC), I would do all the approaches on my home built simulator. It is great to fly the sim before going to a new airport - or just to refresh yourself on the approaches before a trip.