your open to use any mobo your motherboard/case/cpu/psu combination can handle. software has no serious level of control, except on linux based OS, because AMD cards are slightly more favorable on linux.
Not sure about the GTX 690. Heard there were a lot of problems of FPS drops. Quad sli GTX 680 or Quadfire 7970 GHz edition should do the job . OVERKILL.. KILL .. KILL..KILL