will they work in crossfire?

[johnnytrek17]

I have a ROG Crosshair V formula motherboard and a EVGA GTX 550 ti videocard and a guy would like to trade me his 2 videocards for it; sapphire vaporX 5750 1gb ddr5 and one sapphire vaporX 4870 1gb ddr5 and I wanted to know since they are different model videocard if they still would work together in a crossfire setup?
Thanks for your time,
John

 

[Novuake]

Not at all.