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I've been having a number of problems setting up a litecoin mining rig.
I'm currently running a q6600 rig with 4gb DDR2 and 2x HD6950 cards. First thing I did was a fresh install of windows 7 64bit. Installed the latest ATI drivers 12.10 (SDK 2.8 ). Then I tried to configure cgminer 2.10.0 and Reaperv13 beta. I did try unlocking the shaders and overclocking the 6950's (up to 925/1350, 1.2v), but since I've been having trouble I've gone back to stock settings.
Here are the configs I've been using:
Reaper litecoin.conf:
host coinotron.com
port 8322
user xxx
pass xxx
protocol litecoin
worksize 256
aggression 16
threads_per_gpu 4
sharethreads 18
lookup_gap 2
gpu_thread_concurrency 5632
Cgminer:
cgminer --scrypt -o http://coinotron.com:8322 -u xxx -p xxx --shaders 1480 --intensity 18 --worksize 128 -g 1 --thread-concurrency 8192
Ok so the first big problem is that I'm getting quite low hashing scores from these cards. Between 290-300kh/s from each max, total 600kh/s(from both cgminer and Reaper). The Litecoin hardware comparison (http://wiki.litecoin.net/index.php/Mining_hardware_comparison) indicates I should be getting another 100-200kh/s per card from these babies. A little disappointing.
Second problem, I read that using catalyst 11.2 and SDK 2.5 may give better performance. I installed these, and then found that both cgminer and reaper couldn't start the Opencl kernel and refused to mine (same configs). In fact the only way I could fix this at all was to just reinstall the catalyst 12.10 driver package. Messing about with the drivers was also frustrating, crashing, blue screens and install failures all over the place.
Third problem, one of my cards seems to be 'unlockable', guess that's unlucky. The other card unlocks the extra shaders then performs about 10% less in mining hashrate. Guess the extra shaders are not any good. (Probably no solution to this one but I just thought id moan about it anyway)
Is there anyone out there who can help me? I've just spent most of the weekend trying to get better performance to no avail
