.la z68 ex3 gen3 con crossfire ---> VGA Club 3d Radeon HD 6870 Core 900MHz Memory GDDR5 4200MHz 1GB 2xDVI HDMI 2xminiDisplayPort x2 ??? va bene???

oppure

z68 ex3 gen3 + sli: VGA EVGA GeForce GTX550 Ti Core 900MHz Memory GDDR5 4008MHz 2048MB DVI HDMI x2 ???????????????????