Hello and thanks for the help. I have a MB with 4 memory slots, right now I have 2 4GB sticks and 2 slots empty, so I wanted to add 8 GB more, but is cheaper to buy 1 stick of 8 GB than 2 of 4GB. Also, my MB supports 2133 and the memory would be 2400. I know it's not ideal, but would work?