Just wanted to throw out my setup for informational purposes before I add 2 more cards and a new system. Also, if I can be doing better, please let me know

MSI 970A‑G43
AMD Athlon II x4 630
Windows 7 x64
32GB DDR3
2TB HDD
VisionTek RX 480 8GB
XFX RX 480 8GB
Crimson 17.5.2

Wattman Settings for both cards:
Core Clock @1075mhz
-16.5 Intensity
State 6 @910mv
State 7 @929mv

Memory Clock @2200mhz
State 1 @920mv

.bat file is as follows:

setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
ZecMiner64.exe -zpool ssl://us.zenmine.pro:9999 -zwal znpEN4YXZ1xHXgQvwAckWVYJdpGGoDnsZ2s.Ajek -zpsw x -tt 70,70 -fanmax 85,85 -fanmin 35,35 -i 9,9

Running at 542 - 549 h/s total