I am upgrading my cpu from an outdated A10 5800k to the Ryzen 5 1400. I would like to also upgrade my ram to DDR4. I am a poor college student so $110 seems like a lot to pay for 2x8gb of DDR4 ram. Will I see a significant decrease in performance if I get a single 8 gb DDR4 stick now? I am planning to add another 8gb in the future. My second question, would 2x4gb be sufficient?