One type of RAM

[shaharhada]

Some northbridges also contain integrated video controllers, also known as a Graphics and Memory Controller Hub (GMCH) in Intel systems. Because different processors and RAM require different signaling, a given northbridge will typically work with only one or two classes of CPUs and generally only one type of RAM.
What the meaning one type of ram?
1. The one kind that is the computer. In a computer can only one RAM from the only one provider.
Or :
2. The one kind of RAM from the type of RAMs that is selected from Different RAM (If possible) in the computer, so if the one computer have 2 kinds of RAM, the Northbridge select one of the to work?
In the 2 clause I meant to:
Is in one computer can be 2 kinds of RAM?
Thanks for helpers.

 

[JohnBonhamsGhost]

you may need a better translator to make this post/question make more sense.
but as far as i can tell you are asking about using different make/model of RAM mixed together in a system?

if so, it depends;
sometimes you can mix & match with no issue, sometimes you'll experience lower performance, sometimes you may be stuck at default speeds(2133MHz), sometimes you may not boot at all, etc...

your motherboard manufacturer will always offer a QVL of compatible RAM kits.

 

[USAFRet]

a given northbridge will typically work with only one or two classes of CPUs and generally only one type of RAM

Generally, a very short list of CPUs.
And the type of RAM would presumably be DDR DDR2, DDR3, DDR4, etc. Only one...