I recently ordered a Lenovo Ideapad 720s and discovered that, to my horror and disbelief, there is only a single DIMM slot and no sign of soldered RAM. I noticed that a couple of Lenovo's newer laptops (and not just their low end stuff) seem to be designed with only single channel memory. The laptop is otherwise nicely specced for the price (around $770 with i7-8550, MX150, 8GB ram, 256GB NVMe SSD).
That's pretty cheap for an 8th gen i7 + MX150 + 256GB NVMe...that may have been a giveaway that there was SOMETHING amiss. The Acer Swift 3 that TR just reviewed with an i5 is going for 720 USD right now. Click me.
The i7 version is going for a whopping 999. The Swift systems appear to all have dual channel RAM, too.
I'm not quite sure you'll see any issues with the MX150. It appears to have its own GDDR5. You'll probably be OK, but if it were me, I'd probably return it and look around for something with a dual channel RAM implementation.