Upgrade from 2x4 GB to 4x4 GB?

Jul 1, 2018
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Hey guys i want to add more ram to my system, from 8gb to 16gb and I was wondering if it would be better buying a single 8gb stick or another pair of 4gb, I'm currently running dual channel so I'm afraid buying more ram would make the dual channel feature stop working

Specs:

ASRock ab350 fatality gaming k4
Ryzen 5 2600
2x4 gb hyperx at 2666Mhz
GTX 1060 6gb