The Script
Did a quick study to see hashrates. Concluded the best config script a launch is:
export DISPLAY=:0
export GPU_USE_SYNC_OBJECTS=1
export GPU_MAX_ALLOC_PERCENT=100
./cgminer –scrypt -o stratum+tcp://litecoinp2pool.com:9327 -u (your-litecoin-addy-here) -p anypasswordyouwant –intensity 13 -g 2 –worksize 256 –thread-concurrency 8192 –auto-fan –gpu-engine 1075 –gpu-memclock 1500
Running on 12.04 Xubuntu.
So the 7970 are known for good mem overclocking which is useful for Litecoin
Of the launch script above the –gpu-engine 1075 –gpu-memclock 1500 is the most critical parts. Gigabyte cards perform better with ‘-g 2’
The GPU/Mem ratios test results
First we need to see how fast we can push the memory clock.
GPU/Mem – kHash/s
1024/1425 531
1024/1475 556
1024 1500 578
1024 1525 476
1024/1512 486
1024/1496 571
Thus the 1500 is the ideal target, after doing small increment testing. Now to tweek the GPU clock.
1044/1500 590
1100/1500 545
1066/1500 593
1075/1500 610
1085/1500 580
1080/1500 596
1077/1500 608
And some other testing around 1075, 1076 isn’t as good nor 1074. So I opted to go with 1075/1500. I tried different Intensity levels but 13 was the clear winner. I varied other variables, but not to much avail. The final script shows what works. I get 610kH on average.
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Just an FYI for other folks.
Other 7970 cards should be in the same range, start at 900/1400 and work up.