Just got one of these haswell mobos with my latest graphics card ( HD 7990 ).....so i take it i need the 4770K to go with it then?....where is the cheapest place to get one from? and is there only one chip or is there a revised one?.....also i have 3x4gb of corsair vengeance so will be needing another stick to balance things out or will 3 sticks be ok?