xbox360_peasant

Hi, for years I've been a console peasant, now I want to join the PC master race and upgrade my PC. I'm attending to buy 2nd hand gtx1060 and I know I should upgrade my RAM memory, now I have 4gb ddr4, can I buy 1 more stick of 8gb so in total I'll get 12gb of RAM? this is my specs: Motherboard: ASUS H110M-K CPU: Intel® Core™ i5-6400 2.7ghz 6mb RAM: Kingston 4gb ddr4 2133mhz