can i use pc3 10600 with pc3l 12800 together?

[mojimoji]

i have use a 4GB pc3 10600 vs 8GB pc3l 12800 in my Lenovo Y560 laptop and it is working fine. the original ram is 4GB pc3 in my laptop and the slots are pc3. is it correct that i have done or not?

 

[WyomingKnott]

If it works fine, then it works. There are multiple reasons why what you did is not a good idea.
If I read it correctly, you have two sticks of RAM in a laptop. One is 4GB and one 8GB. First, most people here will tell you not to mix RAM, but only to use matched pairs. This is because you tend to get a lot of incompatibility with modern RAM sticks, even unmatched sets of the same speed from the same manufacturer.
Second, by mixing sticks of different sizes you are probably going to single-channel mode. Dual-channel mode memory is faster, so you have slowed the machine down.
Of course, if the machine __originally__ had 1 stick of 4GB memory it was running in single-channel mode anyway. So all you have done is added more memory, which won't hurt your performance. The general advice will be to get two matched sticks and use them together to get dual-channel mode and best compatibility.

 

[mojimoji]

@senior moderator
you are correct and i should put match pairs.
is it good to put 4GB pc3l 1600 or 8GB pc3l 1600 behind my 8GB pc3l 1600 ?

 

[mojimoji]

you are correct and i should put match pairs.
is it good to put 4GB pc3l 1600 or 8GB pc3l 1600 behind my 8GB pc3l 1600 ?

 

[WyomingKnott]

Common wisdom is to purchase a matched pair - two the same in a package. If you are going to mix, pick two the same size to give you the best chance of getting dual channel. Then check to ensure that you got dual channel.