Hd 7950 gui miner too slow

[Sena]

Hello everyone.

I have two hd 7950, and at 1100 MHz i am getting 550 mhash/s on one, my friend is getting 580, and lot of other people on internet.

 I tried varius things, but no luck, i tried varius vlags, this one seems fastest for me:  -v 1 -w 256, but i am still lagging 20-30 mhash/s, i also tried disabling aero, no luck.

If anyone could help i will really appreciate.

Very best regards.