Hey I have a different HIS 7950 (the reference one) and it too wasn't listed in the mining wiki. It took a ton of playing around but I finally have mine happily mining at 615 KH/s. Here is the guide and settings that I used:
I followed this wonderful guide to get my setup working:
http://www.overclock.net/t/1461916/tutorial-ultimate-guide-to-tweaking-amd-cgminer-3-7-2-kalroth-edition-sgminer-instructions-included-aswell-get-the-most-hash-out-of-your-gpuThe only thing that I did differently from the guide is I used the new version of sgminer 4.1 which supports xintensity like cgminer-kalroth. It seems like the OP is in the process of updating the tutorial with this info but for the time being you can just read the xintensity section for the kalroth version and apply the logic to sgminer.
Settings:
1. I used the optimized sgminer 4.1 instead of regular cgminer.
2. I set xintensity to 4, gpu-threads to 2 , and I set thread concurrency to 8193. I tried tons of thread concurrencies but this worked way better than all the others as noted in the guide.
3. I set memclock to 1350 and gpu-engine to 1000.
This is absolutely critical as the memclock seems to have the biggest effect on the hashrate. For example, if i set memclock to 1340 or 1360 I would only get 550 KH/s, but at 1350 I get 615 Kh/s.
4. Powertune and worksize seem to do nothing for the hashrate. I didn't set a powertune, I used 256 for worksize.
Example bat:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
timeout /t 4
sgminer.exe -o stratum+tcp://us.clevermining.com:3333 -u WORKER_NAME -p PASSWORD --xintensity 4 --thread-concurrency 8193 --gpu-threads 2 --gpu-engine 1000 --gpu-memclock 1350
