Just For Curiosity's Sake

Can you overclock RAM? It might seem like a silly question to those of you who are more experienced, but I am fairly new to the PC world (my family still has a Mac from '07). Also, would two kits of 2x4GB 2133 CL9 or two kits of 2x8GB 1866 CL9 be faster? Thanks in advance.

Yes you can on a motherboard capable of overclocking. 2133 will be faster whilst having 16gb will give you more memory to use. You generally won't need that much ram