Memory Ram

[lmkjr2022]

I have a question. My model number for my memory Samsung 8GB DDR5 4800 MHZ 1Rx16 UDIMM DESKTOP RAM MODULE M323R1GB4BB0-CQKOD CL40.
This number when searched on ebay has used this number PC5-38400. Now when I checked eBay there was a r and u suffix for both Non-ECC Unbuffered that is
PC5-38400R and PC5-38400U. Again they are both unbuffered NON ECC. So what is the difference between PC538400R and PC5-38400U. The “R” and “U” suffix meaning. I just want to make sure I get the correct Ram.
Mike

[PeterOz]

I just want to make sure I get the correct Ram.

Best to look at the cpu and the mb compatibility list

The “R” and “U” suffix meaning.

[ol]
[li]Registered or buffered memory, which improves signal integrity (and hence potentially clock rates and physical slot capacity) by electrically buffering the signals with a register, at a cost of an extra clock of increased latency. Those modules are identified by an additional R in their designation, for example PC3-6400R.[30][/li][li]Non-registered (a.k.a. “unbuffered”) RAM may be identified by an additional U in the designation[/li][/ol]
from here DDR3 SDRAM - Wikipedia

[Rustys]

posted several forums never returned to reply.