as we knew the overdrive cannot accessed if we only had a PSU with 6 pin PCI-e , but with very simple mod we can run the overdrive with only 2 x 6 pin PCIe and of course we have to make a simple mod for this
i've done this mod, with only connect the empty 2 pins with some cables or other conductive materials...for me only using a paper-clip and we can access the OD @ control center, yippee...
as we knew the last two pins are 12v vsense and ground, but in the case not all psu had the 12vsense line and many PSU brands just put a ground on those two pins

here the pic


and the overdrive screenie


not so great mod, just for one who wanna see the overdrive with 6pin PSU