Do you have a 280X configuration file?
No, I don't have ATI/AMD cards however the cryptomining-blog guys included 2 bat files, the quark one:
set GPU_MAX_ALLOC_PERCENT 100
set GPU_USE_SYNC_OBJECTS 1
sgminer.exe -k quarkcoin -o stratum+tcp://stratum.nicehash.com:3345 -u 14vZ4DHDzhttzKyNAmLzpRq6VLmCGb16vX -p d=0.5 --intensity 18 --worksize 64 -g 2