ASUS - ZenTalk

I'm currently using ASUS VIVOBOOK 15 X512 FAI've 4gb DDR4 2666 CL=19 1.2V RAM installed in my Laptop fixed slot non removable. I want to purchase an 8gb Ram for the second slot that can support Dual channel. Please let me know the specification of th...

I'm using Asus Vivobook 15 x512fa. There is one fixed slot 4gb & one empty slot available for me.I'm confused whether I should go for 4gb+[4gb] or 4gb +[8gb]. In case If buy Ram with same clock speed & all other parameters except using different memo...