Confusion about labeling of DDR4 memory, can anyone clarify?

vsilly

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Nov 17, 2008
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Hello folks, in my work I deal with a lot of computer memory. I need to understand labeling of the memory in order to do my job. Specifically I need to know what type of memory I am dealing with based on labeling of the modules. With DDR2 and DDR3 generation RAM memory types were indicated by a letter following the memory speed rating, for example 10600E vs 10600U vs 10600R. I see no such labeling on the DDR4 generation of memory. Is there any way to tell from the memory labeling what type of memory it is? I have been trying to research this with no success, wondering if anyone has any insights?
 
Solution
Overall i got nothing for ya. However while trying to figure it out I noticed Kingston uses easy part numbers. KVR21L15Q4/32 (I believe to be unbuffered) (the L after the 21) KVR21R15S4K4/32(registered the r after the 21) and so on.

Supahos

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So far most I see listed is by its speed via XMP. As for L or U it's all the same voltage today. Could change in the future. Assuming a professional setting 2133 ddr4 is all you'd ever need. But if you buy faster ram it will run at 2133 just fine (sometimes there is 2400 ram cheaper than 2133)
 

vsilly

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Nov 17, 2008
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The labeling I am talking about indicates whether the memory is ECC unbuffered, ECC registered, or non-ECC. The letter E used to indicate ECC unbuffered, the letter R used indicate ECC registered or buffered, the letter U used to indicate non-ECC unbuffered memory type. In other words I need to be able to tell whether the memory is ECC SODIMM, Non-ECC SODIMM, ECC UDIMM, Non ECC UDIMM, RDIMM, or LRDIMM.

I am not referring to voltage indicators which would have been for example PC3 versus PC3L indicating standard voltage and low voltage.

If the only way to tell would be to look up the specific manufacturer part number that is a little daunting because this information is not always readily accessible. In some cases it is possible to tell by looking at the chips on the module whether it is registered or nonregistered, however layout of chips looks quite different on the DDR4 memory.
 

Supahos

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Overall i got nothing for ya. However while trying to figure it out I noticed Kingston uses easy part numbers. KVR21L15Q4/32 (I believe to be unbuffered) (the L after the 21) KVR21R15S4K4/32(registered the r after the 21) and so on.
 
Solution