Core Setup Info
Each of the 16 cores and threads are given a number starting with 0.
Each physical core is an even number.  Therefore cores 0, 2, 4, 6, 8, 10, 12, 14 are all physical.
There are two core complexes (CCX).  One contains threads 0-7, the other 8-15.
The following is the set of cores and their meaning.

cores				meaning
0					One physical core
0,1					One physical core and its SMT thread
0,2					Two physical cores on the same CCX
0,8					Two physical cores on two different CCX
0,2,4,6				All physical cores on the same CCX
0-7					All physical cores and SMT threads on the same CCX
0,2,4,6,8,10,12,14	All physical cores (essentially SMT disabled)
0-15				All physical cores and SMT threads on both CCX

Test Setup
CPU: Ryzen 7 1700 OCed to 3.9 GHz all cores
Motherboard: ASUS Prime X370-Pro
Memory: Corsair Vengeance LPX 3000 c15 (clocked at 2400 with DOCP settings)
OS: Ubuntu 16.10
Kernel: 4.11RC1
Drivers: Mesa Git (Oibaf PPA)
Notes: All game tests conducted without VSYNC.  No game options selected result in 100% GPU
utilization.
A * next to a score indicates the highest result out of the benchmark.
A ** next to a scores indicates the lowest result out of the benchmark.

CSGO (take with grain of salt, not actual benchmark)

cores	fps
0		120
0,1		180
0,2		230
0,8		220

Tomb Raider (2013)
Settings: Fullscreen 800x600, LOW

cores				fps (avg,min,max)
0					53.5**,33.9**,66.4**
0,1					107.6,63.4,136.9
0,2					138.4,88.9,175.6
0,8					144.5,57.1,91.2
0,2,4,6				164.2,108.3*,209.2
0-7					162.1,102.8,207.2
0,2,4,6,8,10,12,14	166.2,106.0,210.7
0-15				167.7*,105.6,217.6*

Notes:  This game is very well optimized for Linux and scales very well across at least 8 cores.
When the game is on two cores across CCXs the average is higher than on the same CCX while the
minimum is lower.  This is most likely because each of the threads are able to use the extra
available cache and have little interthread communication.  When they do have interthread
communication however, the frame rate, and therefore the minimum suffers.

DXMD
Settings: Fullscreen 800x600, ULTRA

cores				fps (avg,min,max)
0					6.8**,0.3**,12.1**
0,1					14.1,4.4,25.3
0,2					17.5,4.7,32.0
0,8					8.0,1.5,28
0,2,4,6				37.1,16.3,60.5
0-7					41.6,18.3,68.3
0,2,4,6,8,10,12,14	44.3,17.9,69.3
0-15				43.5,28.6,68.3

Notes:  The results with cores 0,8 enabled was clearly causing an issue.  With the bandwidth
between CCXs being limited, and the latency being high the graphics card was not being fed.
When the graphics card was fed, it was a lot at the same time, but most of the time it starved.
This is most likely because the game requires a lot of interthread communication.
See picture:  https://drive.google.com/file/d/1rtX8DfNlgpLzj4v_Q2G_ZFlxPh2UGqgvXw/view?usp=sharing