You are reading the memory in CPU-Z after the OS loads? Then, there is nothing wrong with the modules themself and cannot be a "DOA" product.
The subject of "DOA" can be a lengthy one in which I will not address in detail in this thread. Basically, if you recieved the correct part, and it is not working then you are eligible for RMA, not DOA service- as the guidelines are often different between the two.
CPU-Z reads directly from the SPD chip on the module, regardless if the OS or BIOS recognizes the module.
In some cases, if you mix one module with another, the OS may recognize only one, yet programs like CPU-Z will still be able to read from the SBD chip since both modules are inserted.
This is not caused by the modules themselves. It's a compatibility issue. When you mix two different modules it can cause complications for the chipset, and quite possibly one of the modules (or even half of one module) gets completely ignored by the OS.
Are you mixing modules?
What OS are you using?
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