Sorry guys, I still have problem with my GIGABYTE GV-R928XOC-3GD. I have three of these, each in separate machine.
With one, I am getting 130 khash/s (and I am happy with it). The other two have ~70 khash/s and I can not get any more out of them (I start getting HW errors). Do you have any clue what may be the problem?

ultracoinminer --scrypt -o stratum+tcp://ultra.leetpools.com:3333 -u XXX -p XXX --lookup-gap 2 --thread-concurrency 16384 -g 2 -w 256 --gpu-powertune -20 --auto-fan --temp-target 72 --temp-overheat 85 --temp-cutoff 90 --gpu-memclock 1500 --gpu-engine 1000 --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600 -E 1 -s 1 -Q 0 --intensity 12

Thanks in advance!