RAM Upgrade Question (Dual Channel)? - resolved

I recently upgraded the memory and ssd in my Asus ROG Zephyrus S laptop. I have since noticed a drop in benchmark scores. The laptop came with 16gb of DDR4 2666mhz. It had 8gb soldered to the motherboard and another 8gb in the only sodimm slot and they run dual channel which is a significant performance increase. I upgraded the 8gb sodimm stick to a 16gb one. Can it still run dual channel with this upgrade?

Edit:

So after some research I found out that for dual channel to happen you have to have 2 ram modules of the same speed AND the same size. So my 1 8gb and 1 16gb can not run dual channel. The upgrade would benefit me if I did a lot of editing but losing dual channel causes noticeable impact on games. Im switching back to the original setup