iron8orn said: Your limited to x8 filtering http://www.asrock.com/mb/Intel/Z87%20Extreme6/?cat=Specifications
iron8orn said: You can only use 1 at x16. x8 is not bad for 2. is it worth it for 3 cards? up to you.
iron8orn said: yeah a lot of boards will. just gotta check the specs.