RAM Upgrade Elitebook 8460P - PC3-10600s or PC3-12800s?

I have an Elitebook 8460p with Intel Core i5-2540m. It currently has 2x 4GB PC3-10600s. I wonder if I would face a problem if I upgrade it to 2x8GB Samsung PC3-12800s. According to the specs sheet, 

Standard:

DDR3 PC3-10600 SDRAM (1333 MHz)

Two SODIMM slots supporting dual-channel memory

2GB, 4GB, and 8GB SODIMMs

Maximum:

Ungradable to 16GB with 8GB SODIMMs in slots 1 and 2

Dual-channel:

Maximized dual-channel performance requires SODIMMs of the same size and speed in both memory slots.

I am also planning to upgrade the CPU to Intel Core i7-2860qm which supports PC3-12800s in the future, so that's why I am considering PC3-12800s as an option. Please help.