What is the specs of the second RAM i need so i can enable Dual-channel

[Siomio]

Hi, my laptop has 2 slots, one is free, I opened the laptop and saw that the ram had the code 862397-855 which is 4GB 2400MHz PC4-2400 1.2v, using a program I noticed that my ram is another, my question is, what are the features of the ram to use to achieve dual channel?

maybe the programs show me wrong details?

so wich ram is the correct , and what ram should i buy?

[Huffer]

The module that was installed will have "bridged" (downclocked) to the maximum speed the motherboard will support i.e. 2133. The Micron part number shown in the CPU-Z screenshot is actually DDR4-2400 SO-DIMM. If you install another DDR4-2400 like this:

https://www.amazon.com/Micron-PC4-19200-2400MHz-260-Pin-MTA4ATF51264HZ-2G3B1/dp/B073SK49F2

You will have 8 gigs running in dual channel at 2133 mhz. It does not have to be exactly the same part number or even memory maker as long as the specs are the same. 

Post back with any more questions and please accept as solution if this is the info you needed. 

[Siomio]

Thanks so much for the answer, so it is sure not 2666?I reopened the laptop and noticed that they had just stuck to a different tab, turned around the ram and saw that it was the same as the cpu - z point, so the question is if I buy a ram with 2666 and cl 17 and put it will work dual channel;

[Huffer]

Yes the key thing is to match the characteristics of the existing memory....speed latency density and you pretty much assure dual channel operation. Even if you have one 2666 and one 2400 you will still likely get dual channel as long as latency and density are the same. 

[Siomio]

one last just to be sure and we're done, even though it's 2666, if I buy one with 2400 or 2133 I will get the dual channel because it will drop to 2133; of course i have to know CL too!

[Huffer]

The further you diverge from what you have the more risk it will not run in dual channel. If you can find it get 2666 and second choice is 2400; I would not try 2133. 

[Siomio]

thank you very much, i appreciate it very much, your answers were very quick and informative! Absolutely Satisfied!

[Siomio]

Hello again i forgot to ask if can use other brand than the pre-installed but with the same details ( 2666Mhz , 19 CL) 

[Huffer · Accepted solution]

Yes I believe I said that. You can mix Samsung with Micron or something like that, yes.