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How does dual channel mode work on a laptop?

Based on what I already know, the two ram sticks have to be of the same size. What about the speed?
If my laptop runs at 2133mhz ram speed and I get another ram stick with a higher speed but same size, I know my motherboard will reduce the speed to the supported speed but will the two ram sticks run in dual channel mode? 

(Since they have the same size and are both running at same speed)

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5 minutes ago, Licht said:

but will the two ram sticks run in dual channel mode?

Typically, yes.

Hand, n. A singular instrument worn at the end of the human arm and commonly thrust into somebody’s pocket.

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It can run dual channel even with different sized RAM, but only up to double the capacity of the smaller one. My laptop has one 4GB(soldered) and one 8 GB stick. It runs dual channel up to 4+4 GB and the last 4GB single channeled.

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24 minutes ago, WereCatf said:

Typically, yes.

Thanks : )

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16 minutes ago, Tegneren said:

It can run dual channel even with different sized RAM, but only up to double the capacity of the smaller one. My laptop has one 4GB(soldered) and one 8 GB stick. It runs dual channel up to 4+4 GB and the last 4GB single channeled.

Oh nice 

I have just two slots available

So are you saying if I have a 4gb ram stick installed and another 8gb ram stick installed, they'll both run in dual channel?

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15 minutes ago, Licht said:

Oh nice 

I have just two slots available

So are you saying if I have a 4gb ram stick installed and another 8gb ram stick installed, they'll both run in dual channel?

It will run in dual channel, until the 4GB stick and half of the 8GB stick is filled.

 

Youll have 8GB of dual channel and 4gb of single channel RAM available

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30 minutes ago, Licht said:

Oh nice 

I have just two slots available

So are you saying if I have a 4gb ram stick installed and another 8gb ram stick installed, they'll both run in dual channel?

Yes, but I will recommend getting a matched set if possible. On my laptop 4GB is soldered so I had no other option if I wanted more than 8GB total

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1 hour ago, Noah0302 said:

It will run in dual channel, until the 4GB stick and half of the 8GB stick is filled.

 

Youll have 8GB of dual channel and 4gb of single channel RAM available

Oh I understand now 

Thanks 

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52 minutes ago, Tegneren said:

Yes, but I will recommend getting a matched set if possible. On my laptop 4GB is soldered so I had no other option if I wanted more than 8GB total

Thanks I'll get an additional 8gb stick then 

I have one 8gb stick already.

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Ideally, you'd also want to get the same type ... SS or DS.  (single sided or double sided ... which isn't always the same as having ram chips on both sides of the ram stick).

Most 8 GB sticks should be of SS type by now. 4 GB sticks always were, because nobody made chips smaller than 512 MB (8 chips x 512 MB = 4 GB) and now that even 2 GB chips are made, it's cheaper to use 8 x 1 GB chips instead of 16 x 512 MB 

 

Also, you'll want to match the type ... ex try not to mix DDR3 with DDR3L  as DDR3 needs at least 1.5v to run, while DDR3L can work with 1.35v (most will work with 1.5v but can overheat, and a few would outright refuse to work at 1.5v)

You probably have DDR4 though.

 

 

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38 minutes ago, mariushm said:

Ideally, you'd also want to get the same type ... SS or DS.  (single sided or double sided ... which isn't always the same as having ram chips on both sides of the ram stick).

Most 8 GB sticks should be of SS type by now. 4 GB sticks always were, because nobody made chips smaller than 512 MB (8 chips x 512 MB = 4 GB) and now that even 2 GB chips are made, it's cheaper to use 8 x 1 GB chips instead of 16 x 512 MB 

 

Also, you'll want to match the type ... ex try not to mix DDR3 with DDR3L  as DDR3 needs at least 1.5v to run, while DDR3L can work with 1.35v (most will work with 1.5v but can overheat, and a few would outright refuse to work at 1.5v)

You probably have DDR4 though.

 

 

Yeah mine is DDR4  

Thanks for the warning

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