Not worth the bother IMO
https://www.cpubenchmark.net/compare/AMD-FX-6350-Six-Core-vs-AMD-FX-8350-Eight-Core/1910vs1780
If you look at the "score" it looks impressively higher. Clock speed is same, single-core performance advantage negligible. Translation: you will seldom see any noticeable speed boost.
If you are running VMs, you have extra core for that.
EDITED: 13 Nov 2018 16:30 by DSMITHHFX