My 280x:

del *.bin
color 0f
sgminer.exe --kernel jackpotcoin -o stratum+tcp://www.hashharder.com:9958 -u YOURUSER -p YOURPASS -I 18
pause

I get 2.43 Mh/s with 1050gpu clock and 1500 memory. Probably can do better I am no expert.

My 270 does 1.353 Mh/s