i am in the step up program waiting on a gtx 680. finally found a evga gtx 680 in stock at newegg, but it is the superclocked. i know i can sli the none oc with the oc, but the question is oc the second to match the clock speeds or down clock the sc card to match the reference? i just want the smoothest performance...
 
also i saw (on the forums here) that you can flash the cards firmware to match the sc? if so will this void my warranty? thx in advance for the replys