To help anyone with Sappire Vapor-X HD 7950 3GB DDR5, the following are my settings and hashrate with Vertminer.

I have 10 GB of RAM 2 sticks of 8 and 2 GB each running Win 7 64 bit Enterprise

Batch file settings:
setx GPU_MAX_ALLOC_PERCENT 200
setx GPU_USE_SYNC_OBJECTS 1
vertminer --scrypt-vert -w 256 -I 13 -g 2 --lookup-gap 2 --gpu-powertune 20 --gpu-memclock 1500 --gpu-engine 1100 --thread-concurrency 10240,10240

I played around the intensite, thread concurrency a bit to achieve the following max hash rates.

http://i.imgur.com/OgSFzhh.gif

Thanks.

Any doge donations welcome!
DOGE: DRxAxERbGJZKZhG8vEP6eQHX4TtWg6ws5S