If it helps anyone out there:

xfx DD R7950 = 375k/h-380k/h Hits 380k/h-383k/h with primary monitor off... Temp= 73C fan sits at 47% 0 REJECTS 0 H/W after 2hrs

setx GPU_MAX_ALLOC_PERCENT 200
setx GPU_USE_SYNC_OBJECTS 1
vertminer --scrypt-vert -o pool:port -u user -p pass --lookup-gap 2 -g 2 -I 13 -w 256 --thread-concurrency 6912 --auto-fan --gpu-fan 30-75 --temp-cutoff 90 --temp-overheat 85 --temp-target 72 gpu-memclock 1500 --gpu-engine 1070


Hope this helps
-J3TW4V3