I'm trying to make an old laptop work better. I already have a single spare stick of ram and it currently has a Dual Channel RAM configuration. Is 2x2GB DDR3 PC3-10600 CL9 SODIMM Dual Channel Ram configuration or 8GB DDR3L PC3-12800 CL11 SODIMM RAM Single Channel Ram Configuration better? Furthermore, the computer only supports 8GB of RAM total, so buying another 8GB stick would be waste of money because I would achieve the same effect as buying 2x4GB RAM.