hi, i have this laptop with 1 SAMSUNG 2666mhz 19CAS ram:https://www.newegg.com/global/il-en/samsung-8gb-260-pin-ddr4-so-dimm/p/1X5-000A-002S4
now i am wondering what to buy to do dual channel, either buy a stick with same speed and timing for almost 49 usd ( price in my country Q.Q) or get new...