Question Decode this Crucial/Micron memory

[bryan305]

I have a intel nuc with an 8gb Crucial ram stick coded CT8G4SFD8213.C16FBD1. I ordered another stick of the same, but I received a CT8G4SFS8213.M8FB stick instead of the CT8G4SFD8213.C16FBD1. I can’t figure out what the .M8FB or .C16FBD1 designators mean. I only see that my current is dual rank and the new one is single rank.

When I ran benchmarks on userbenchmark.com, I got this with just the first stick:
"Crucial CT8G4SFD8213.C16FBD1 1x8GB
184 User benchmarks, average bench 41%
1 of 2 slots used
8GB SODIMM DDR4 clocked @ 2133 MHz"

But then when I added the new stick, I got this:
"Unknown CT8G4SFD8213.C16FBD1 1315 CT8G4SFS8213.M8FB 16GB

2133, 2133 MHz
8192, 8192 MB

Relative performance n/a - insufficient samples"

Speed essentially doubled, but I'm concerned about running into random problems later.

Any help understanding what I’ve got is appreciated.

Thanks.

 

[Colif]

You would think there would be a crucial page you can search on. I can't find much at all on the replacement stick.
I know CT8G4SFD8213.C16FBD1 runs at CAS latency 15 as I originally thought the CL16 was its latency, now i find I am wrong.

Not sure what speed your replacement runs at. I think its 15 as well.

i found the other memory on user benchmark - https://ram.userbenchmark.com/SpeedTest/180423/Crucial-CT8G4SFS8213M8FB-1x8GB

its possible it doesn't show both together as its not always advisable to run 2 different types of sticks at once, they are unlikely to be running in dual channel. It can cause errors.

 

[bryan305]

I did get a response from Micron...interesting:

Thank you for contacting Crucial.

With regard to your query, we would like to inform you that, the part you have received is correct, the difference is extension. Those extension is use to find the material # and its for inventory purpose, both are same specification.

If you have further questions, I welcome your reply. You can also visit our Contact page for other ways to reach us.

Regards,

Sabarivasan
Micron Consumer Products Group
The Crucial Team