I'm running a Phenom II 1055T (x6). It actually seems to be ok for pretty much everything, including gaming at 1440p (I've upgraded the GPU 3 times and am currently running a GTX 1070, 16GB of RAM, and an SSD). Not bad for a system that's almost 7 years old.

The only issue is that I tried using the Oculus, and it won't work. Apparently the CPU doesn't have some instructions required for VR. I tried using a hacked version of the Oculus setup program that bypasses the CPU check, but it still won't work.

Which is why I've been thinking about a Ryzen 5...