Can DDR4 memory have 4G and 8G dual channels?

In the case of compatibility, the first 4G capacity and the other 4G capacity of 8G strips can work in dual channels, and the remaining 4G capacity can only work independently.

This 4GB and 8GB stripe must be the same generation of memory.

Then we can know whether it is compatible by field testing on the computer.

If the motherboard specification says that 2400 will automatically drop to 2 133, it means that your computer uses 2 133MHz. Of course, 2400MHz is also acceptable.

Extended data:

DDR4 memory will have two specifications. Among them, the DDR4 memory transmission rate with single-ended signaling signal has been determined as 1.6 ~ 3.2 Gbps, while the DDR4 memory transmission rate based on differential signaling technology will reach 6.4Gbps.

Because it is almost impossible to realize two interfaces through one DRAM, DDR4 memory will have two specifications based on traditional se signal and differential signal.

According to many people in the semiconductor industry, DDR4 memory will coexist with single-ended signal (traditional SE signal) and differential signal (differential signal).

It is expected that these two standards will introduce different chip products, so we will see two incompatible memory products in the DDR4 memory era.

References:

Zhongguancun online-dual channel memory should be organized like this.