Please give me your startup line. Have you specified keccak and use the correct miner?

Heres my run script for 280X

color 3
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --keccak -I 9 -g 1 -w 256 --gpu-engine 1100 --gpu-memclock 1000 -o stratum+tcp://hxceu.nut2pools.com:6020 -u username.worker -p password