Hi, Anyone have configuration to R9 280X with X15 algo

Actually i have only 1.8Mh/s when i read the average on R9 280X is 2.6MH/s
Could you help me

One of my rigs with 280x has next settings:
sgminer.exe --algorithm bitblock -o server -u user -p x --intensity 16 --thread-concurrency 8192 --lookup-gap 2 --worksize 128 -g 2 gives 2,44 Mh for me (no HW).