News Overclockable server-class ECC RAM options expand as AMD Threadripper chips arrive — G.Skill introduces Zeta R5 Neo DDR5-6400 RDIMMs

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Too bad these are only RDIMMs. I checked, but couldn't find G.Skill selling any DDR5-6400 ECC UDIMMs.
Nobody is selling anything but 4800 UDIMMs when it comes to ECC. On the RDIMM side there's 4800, 5600 (JEDEC and XMP), 6000, and 6400.

Just a wild guess on my part, but I've been thinking ECC UDIMM demand is probably low compared to RDIMM since only desktop CPUs use it. I'd have been pretty happy if there was anything faster than 4800 (I'm not sure I'd replace what I have now though).
 

TJ Hooker

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Nobody is selling anything but 4800 UDIMMs when it comes to ECC. On the RDIMM side there's 4800, 5600 (JEDEC and XMP), 6000, and 6400.

Just a wild guess on my part, but I've been thinking ECC UDIMM demand is probably low compared to RDIMM since only desktop CPUs use it. I'd have been pretty happy if there was anything faster than 4800 (I'm not sure I'd replace what I have now though).
You can get DDR5 ECC UDIMMs at least as fast as 5600 MT/s.

 
Did you ever check the QVL for your motherboard? There's also some SK Hynix DDR5-5600 that's been qualified, but seems virtually impossible to find.
Retail SK Hynix memory modules seem few and far between in NA/EU in general. Nothing other than 4800 modules even appear on their website right now. Even then I can't find any traces of the 32GB modules period.
 
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