I am building a new gaming system soon and can not seem to make up my mind if to use 790 or 780 chipset. Correct me if I am wrong, but the only main difference between the two is the 790 supports DDR3. Through much research I do not see the performance gains with DDR3 over DDR2 to justify the cost difference. Please enlighten me if my assumption is incorrect. My new build will consist of either a GTX 260 or 280, Quad CPU running Vista Ult.