I have vivobook-15 X512DA-EJ502T . 8GB RAM(4GB soldered). I want to know if it will actually improve performance if I upgrade the other 4GB with an 8GB stick. because of the soldered ram it seems that I can never upgrade the ram coz it will always be (8+4) because I cannot replace the soldered one so different size of rams will not allow me to get the benefit of dual channel ram. ?? What should I do?