I did a dual core but now that I'm experimenting with version 10 I might have to upgrade to a quad core. The dual is fine for VP9. VP10 the visuals where plastic is see through and the detail that is going into some of the tables are just amazing.
I'm very much into the DIY scene and I'm going to be redoing my [censored] Doo mini arcade cabinet soon. That contains a modded X-Box 1 with about 65,000 games on it.