ok quick update, flashed my 7900gs with 7900gtx bios, unlocked and memory optimized.
so far on base settings 1,24v, 500/1200mhz it runs really well, tested in atitools, no artifacts whatsoever.
in bios it shows 7900gtx and in win7...
lol, better later than never ;]
i tried to OC with soft, but i could only do that on tweaked drivers with custom inf, got weird artifacts and screen flicker
so i flashed my 7900gs with 790gsuov.rom (mem optimized and unlocked),...