Can your motherboard even handle that much RAM? The most I think your laptop can handle is 8GB.
We have E6520's that run 16GB of RAM and its limited by Sandy Bridge's arch. not being able to handle more RAM. IB can handle more RAM. We started buying precisions because they have four DIMM slots but we'd like to fall back to just using one type of machine.
Eventually there will be, question is when, 16GB/stick for both Consumer PC's and Notebooks -- initially it will be very cost prohibitive. Most 16GB/stick memory is Registered ECC for servers (now).