Hi all
Some updated optimal settings:
HD7870XT/270X ~75-85Kh/ssetx GPUMAXALLOCPERCENT 100
setx GPUUSESYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 256 -g 1 -I 17 --thread-concurrency 25948 --no-submit-stale
--lookup-gap 3 --expiry 10 --scan-time 1 --queue 0
HD7950 (1044/1500) ~100Kh/ssetx GPUMAXALLOCPERCENT 100
setx GPUUSESYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 256 -g 2 -I 12 --thread-concurrency 16384 --no-submit-stale --expiry 10 --scan-time 1 --queue 0
HD7970/280x (1044/1500) ~135Kh/s (280x)setx GPUMAXALLOCPERCENT 100
setx GPUUSESYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 256 -g 2 -I 12 --thread-concurrency 16384 --no-submit-stale
--lookup-gap 2 --expiry 10 --scan-time 1 --queue 0
R9 290 8GB RAM (1040/1400) ~180Kh/ssetx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 64 -g 1 -I 18 --thread-concurrency 42000 --no-submit-stale
--lookup-gap 2 --expiry 10 --scan-time 1 --queue 0
R9 290 4GB/6GB RAM (1040/1400) ~140Kh/ssetx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 64 -g 1 -I 18 --thread-concurrency 42000 --no-submit-stale
--lookup-gap 3 --expiry 10 --scan-time 1 --queue 0
R9 290X 8GB RAM (1040/1400) ~195Kh/ssetx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 64 -g 1 -I 18 --thread-concurrency 45000 --no-submit-stale
--lookup-gap 2 --expiry 10 --scan-time 1 --queue 0
R9 290X 4GB/6GB RAM (1040/1400) ~155Kh/ssetx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
ultracoinminer -o stratum+tcp://ultra.nitro.org:3337 -u xxx -p xxx --scrypt-jane --sj-nfmin 4 --sj-nfmax 30 --sj-time 1388361600
-w 64 -g 1 -I 18 --thread-concurrency 45000 --no-submit-stale
--lookup-gap 3 --expiry 10 --scan-time 1 --queue 0
1.Sometimes on HD7950/7970/280X cards gives better results --thread-concurrency 16484
2.If one of your cards is less efficient than it should have, reboot your system (Windows / Linux).