Question If you mix RAM capacities, can you still run in dual channel?

[shottyjotty]

Specifically laptop memory. I'm using a Lenovo V155-15API laptop for some editing and starting to hit the useable 6gb of 8gb ram installed. One ram stick is soldered to the motherboard and the other is occupied by a 4gb stick.

If i replaced this stick with a larger one, would both the sticks run in dual channel until I start using 8gb+ of ram? Or will the whole thing just be single channel?

 

[Ralston18]

"Systems with 4GB soldered to the motherboard are only upgradeable to 12GB. Only systems with no soldered memory are upgradeable to 16GB."

Source = Kington's website:

https://www.kingston.com/us/memory/search?DeviceType=3&Mfr=LEN&Line=V155&Model=99951

Laptop Maintenance Manual:

https://download.lenovo.com/consume...5.pdf?linkTrack=PSP:ProductInfo:HarwareManual

 

[shottyjotty]

Well, either way, would the 8 gb stick run in dual channel and then the remainder in single channel? Or all of it in single channel?