2400 G

I am planning on building a small itx build with a ryzen 5 2400g apu and I'm not sure what kind of ram I should get for it, particularly what ram speed. The mobo I got my eyes on specifies it's memory standard as: DDR4 3200(O.C.)/ 2933/ 2667/ 2400/ 2133. I know that the bigger the number is an...