Got Mini-R system with 2x16Gb of this RAM. So it’s not TrueNAS branded. Can you suggest compatible pair which will work? Or what parameters to look for? I can’t find exact PN for sale. Want to upgrade to 64G
If you just want a 32GB module, the part number is RD4R32G48M2400
Multiple sellers online, however I haven’t checked the compatiability with your system beyond it simply being a 32GB module (2 x 32GB = 64GB).
No, I don’t want 32gb modules. I just want 2 more of same 16Gb but can’t find anything online by PN. So I was looking for maybe suggestions on alternative compatible ones.
Right 
I was hoping for something cheaper than that. Afterall, my box came with non-TrueNAS branded RAM
It looks like the label gives you that information–DDR4-2400 (or faster, presumably) ECC RDIMMs–which is the same thing the Amazon listing says.
Edit: I don’t know what, if any,[1] affect there might be on warranty, hardware support, or other factors from using “unofficial” RAM in the system, if any of those are of concern…
h/t Adam Lally ↩︎
I build all my truenas servers from off the shelf parts. If this is just a homelab box with nothing critical, you may consider normal ddr4 3200 ram instead of more expensive ECC. I am rocking 128gb of the stuff in my main server rebuild, just found a 4x32 kit on Amazon and threw it in. If you’re doubling up, have 4 slots, and wanna do it cheaply, consider a 4x16 set of ddr4 3200. But you can’t mix and match so it’s all Ecc or all non-ecc.
Ecc is another layer of data protection which is geared towards business and enterprise applications. That’s the risk of saving money here.
No, you may not, not in combination with the ECC RAM that’s already in the system–which is what OP is specifically asking for.
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You read too fast. I already said it’s an all or nothing proposition, you can’t mix and match.
So, since OP specifically said they want to add to the RAM that’s already in place (perhaps you read too fast and missed that?), your suggestion is irrelevant to this thread. And that’s assuming that non-ECC RAM will even work in the Mini-R–my experience is that systems using RDIMMs require ECC, but I wouldn’t be too surprised to learn there are exceptions to that…
What market / country are you in? I find plenty of hits with the part number ISG-RD4R16G88H2400. Any RAM with the same specs would work though.
USA. Couldn’t find same exact one
Well this should work But just double check the specs.
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It’s kind of funny how hard they’re hitting the “won’t work with normal PCs” in that listing. Good, I’m sure, but still kind of funny.
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I’m suggesting an alternative option, not arguing. It’s his choice to add more ecc or swap it all for non-ecc at his price point.
What I know about ecc is that nothing requires it per se, but you can only use it where it’s supported. I seriously doubt that box would refuse to boot with non ecc ram but I see your replies going back a decade on this forum so maybe you know.
Back to the op again, strictly speaking. Contact support and see what options they sell or what other options you have and if anything impacts any warranty or support you may have.
If it were me, I’d be looking for local shops or on ebay for server pull ecc ram, following the original question. Ram and network cards pulled from servers don’t really scare me that much. They work or they don’t, and you can save a bundle. 
Ninja edit: a lot can happen in five minutes lol
When 32GB of RAM is available with the proper specs for around $70 delivered, I wouldn’t worry about taking the risk to use potentially unsupported and arguably poorer technology.
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Totally agree. Significantly cheaper than his Amazon hit.
Low speed (2133/2400 MHz) DDR4 RDIMM is actually cheaper than “normal” (UDIMM) on the second-hand market.
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According to another thread here, this is the mainboard in the Mini R.
https://www.supermicro.com/en/products/motherboard/a2sdi-h-tf
Maybe there is a list of supported modules? Or maybe check yourself which Mainboard is used.
Just look under “Resources”…
I never had any issue with any second-hand RDIMM module from Micron, Samsung or SK Hynix—and DDR4-2400 RDIMM is cheaper than UDIMM, not to mention ECC UDIMM.