Ram not working together

[Fx-53]

Ive got two sticks of corsair XMS that wont work together............i guess there not matched. ANybody now were i can get ram that will match my other stick or would i be better just ditchin both sticks and buying to prematched ones

 

[ResponsiblAdult]

Do an RMA for both sticks? You'll most likely get a matching set. Anybody? Stupid idea?