So I'm trying to learn more about this stuff, but aren't there multiple ECC flavors and the AMD consumer CPUs only support one of them (not the one you'd have on servers?)

Does anyone maintain a list with de-facto support of amd chips and mainboards? That partlist site only shows official support IIRC, so it won't give you any results.

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adrian_b 4 days ago | parent | next [-]

The difference between the "unbuffered" ECC DIMMs (ECC UDIMMs), which you must use in desktop motherboards (and in some of those advertised as "workstation" MBs) and the "registered" ECC DIMMs (ECC RDIMMs), which you must use in server motherboards (and in some of the "workstation" MBs), has existed for decades.

However in the past there have existed very few CPU models and MBs that supported either kind of DIMMs, while today this has become completely impossible, as the mechanical and electrical differences between them have increased.

In any case, today, like also 20 years ago, when searching for ECC DIMMs you must always search only the correct type, e.g. unbuffered ECC DIMMs for desktop CPUs.

In general, registered ECC DIMMs are easier to find, because wherever "server memory" is advertised, that is what is meant. For desktop ECC memory, you must be careful to see both "ECC" and "unbuffered" mentioned in the module description.

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hungmung 4 days ago | parent | prev [-]

Seconding this. I'm looking for a fanless industrial mini PC with out of band ECC and I'm having a hell of a time.

	▲	adrian_b 4 days ago \| parent \| next [-]
		Had you been looking for "in-band ECC", the cheap ODROID H4 PLUS ($150) or the cheaper ODROID H4 ($110) would have been fine, or for something more expensive some of the variants of Asus NUC 13 Rugged support in-band ECC. For out-of-band ECC, e.g. with standard ECC SODIMMs, all the embedded SBCs that I have seen used only CPUs that are very obsolete nowadays, i.e. ancient versions of Intel Xeon or old AMD industrial Ryzen CPUs (AMD's series of industrial Ryzen CPUs are typically at least one or two generations behind their laptop/desktop CPUs). Moreover all such industrial SBCs with ECC SODIMMs were rather large, i.e. either in the 3.5" form factor or in the NanoITX form factor (120 mm x 120 mm), and it might have been necessary to replace their original coolers with bigger heatsinks for fanless operation. In-band ECC causes a significant decrease of the performance, but for most applications of such mini-PCs the performance is completely acceptable.
	▲	nicman23 4 days ago \| parent \| prev [-]
		https://www.asrockind.com/en-gb/iBOX-V2000V something like that?