Quote from: b00mbastic on June 25, 2014, 05:50:26 AM

Hi.
I have a problem with mining YAC on my Radeon 7950 card.
My command-line options are:
yacminer --scrypt-chacha -d 0 --worksize 128 --lookup-gap 8 -g 2 --buffer-size 1295 -R 2560 -o stratum+tcp://yac.coinmine.pl:9088 -u X.1 -p Y --nfmin 4 --nfmax 30 --starttime 1388361600

also I`ve tried another options:
yacminer --scrypt-chacha --worksize 128 -g 1 --lookup-gap 8 --buffer-size 2590 -R 5120 -o stratum+tcp://yac.coinmine.pl:9088 -u X.1 -p Y --nfmin 4 --nfmax 30 --starttime 1388361600

where I could be mistaken?

That's the wrong starttime for YACoin. The starttime for YAC should be 1367991200 (you've put in Ultracoin's starttime), so you were mining at nFactor of 13 instead of 15. Be prepared to change your other settings to work with NF=15... (You will get HW errors unless you lower your -R)