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), pretty easy, no problems
i will overclock it soon so i will update with results but for now, i noticed a 7* celsius temp drop, which is rly weird
anyway, gj juan, gj guys, thanks for help
btw: i tried to flash 7900gs with 7900gtx...