Im considering changing out my crosshair v formula z and oced 8320 at 4.7 for an i7-4790k and an evga z97 classified EATX, I have two 780 classifieds and would be reusing those and likely adding a third, along with all other part besides a new water block for the cpu as i currently have a custom loop. The pc this would go in is just a gaming rig my question is adding a third 780 aside would there be enough of a performance increase to justify the 400ish bucks it would cost to upgrade (im factoring selling the old parts in)