does anyone know if i run sli (2 512mb 7950gt oc) cards. Will it enhance watching hd on my big screen tv ?? or would it be just overkill. running one card without a hitch but thinking of using the other one i have and run sli....thanks...amd am2 6000, crosshair motherboard (not 3 or 4) and ocz reaper memory, 850psu ultra.