I put today my ny new Gigabyte R280X

to my pc but i have a small improvement in kh/s from 450 i went to 600kh/s but i think can go more at least 750 i have to search more the settings.Anyone with the same card???
Almost any 280x, gigabyte most certainly, can do above 700. my asus dc2t can go to 800kh per sec