Mixing Single 8G Single Channel DDR3 1600 with 4G Dual Channel DDR3 130

Just purchased a new Dell 5000 series Inspiron with 8 GB of Single Channel DDR3 Ram 1600mhz.  I use Coreldraw and Adobe Photoshop.  Should I move  on of my 4 GB Dual Channel DDR3 1333 mhz modules from my old Dell 1700 series InspironÉ