I have a 290 and 7950

5.3 mhs on 7950
6.3 mhs on 290

this seems very low any ideas what the problem is?

sgminer.exe --kernel nist5 -o stratum+tcp://east1.us.stratum.dedicatedpool.com:5001 -u nadasmurf.1  -p 1234 --thread-concurrency 8192 --thread-concurrency 8192 --lookup-gap 2 -I 18 --worksize 256 -g 2

this is my settings