Hi, im thinking of building a gaming pc and want to know if these components will work togethor along with windows 7. Cm haf 912 plus, i5 3570k , asrock z77 extreme 4 ,corsair gs 800w psu , 8 gb g-scill ripjaw x ram , asus 6870 , samsung 128gb 830 ssd and dvd drive i plan on changing gpu in a year or 2 i know its a big psu but i might crossfire when i get new gpu thanks in advance