thanks ,,, I am not sure i am able to do this voltage raise when i try to do it with sgminer it says "voltage not changed" ,,,Maybe because these cards are Asus R9 290 (nonx) but "unlocked",, brought very early from OCUK
because they were "unlocked" from new I was able to flash them with a R9 290x bios made by the "stilt" this enabled me to get hash rates of a R9 290x as opposed to a non x