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AMD's RYZEN already supports it. ASUStor's latest generation of NAS devices come with AMD x86_64 processors and ECC RAM as a standard, but ECC RAM in SODIMM format was not cheap, even when the RAM was cheap, either.

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As someone trying to spec out a Ryzen workstation right now I can tell you it's actually harder because Ryzen (unlike EPIC) uses UDIMM ECC, not RDIMM ECC. It's a niche that very few companies wanted to service before AI ram madness. Now the only vendor I can find is v-color:

https://v-color.net/products/ddr5-ecc-oc-u-dimm-server-memor...

But they no longer have 6000mhz stuff in stock (which is ideal for Ryzen due to the 1 to 1 speed match to the memory controller).

It's frustrating :(

I understood that support for ECC ram also depended on the motherboard but not sure. When selecting Ryzens, I only recall seeing many disclaimers for RAM support. Not sure to the causes though.

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