I ran a series of tests using Superposition benchmark software at various settings at 1080p, on my previous set up of my R5 2600x paired with my RX5700 XT, and compared those to my new R9 3900x. The only main difference in set up would be (everything) half the amount of RAM, which didn't seem to make a difference. So without further adu.
R5 2600x 6 core/12 thread:
Med: 6824 Min fps: 45, Avg: 51, Max: 148
High: 6773 min: 44, Avg: 51, Max: 107
Extreme: 5088 Min: 31, Avg: 38, Max: 45
R9 3900x 12 core/24 thread:
Med: 16844 Min: 94, Avg: 126, Max: 156
High: 12146 Min: 75, Avg: 90, Max: 109
Extreme: 5073 Min: 31, Avg: 38, Max: 45
So I was blown away at these results. I didn't expect such a massive jump in standings. However I thought it was quite interesting that the extreme setting came up less with the new set up. Although that's still within the range of variance. It's too late now, but I should have done 3 benchmarks and averaged them. Oh well, live and learn. Quite cool to see some statistical improvements like this.
It's good to be ambitious. What OS are you using?