I recently purchased a AMD EYPC 75F3 CPU and a super micro h12ssl-ct motherboard
Took a lot of research to figure out
Last thing I need is RAM.
Ram is one of those things that really hurts my brain all the different skews and numbers
So I’m trying to figure out what brand/ combination to throw in here I would like to max it out if possible if budget allows I was able to snag those two things pretty cheap relatively speaking to their MSRP
Or maybe maxed out is too much and all the one or two steps down I just don’t even know what that is or where to start
Seems like Supermicro rebrands Micron and Hynix memory. But basically you just need to look for DDR4 ECC. The board supports up to 3200 MT/s RAM and apparently can run all the DIMMs at that speed even if all slots are populated. Page 31 of the manual has a little bit more about memory support. Maxing it out might be difficult, as to get 2 TB in 8 slots you’d need 256 GB DIMMs. I’m not sure anyone makes 256 GB DDR4 on a single stick. You can get eight 128 GB DIMMs (=1 TB) for about $5K-$6K new. I’m not sure about eBay.
Even if you don’t “max it out”, the manual seems to recommend populating all eight slots, so for example if you were only going to have 256 GB RAM, use eight 32 GB modules, and not four 64 GB modules, etc. Yeah, harder to upgrade, but that’ll give the most throughput.
Okay good yeah that’s kind of what I’d gathered I didn’t know if timing matters so much on these types of motherboards and CPUs and no timing matters a lot more for like gaming CPUs
So now I just take to eBay and search around and see what the best deal I can get on the largest dins I can get
I thought for some reason that they used different dims on these server boards than they do consumer boards it’s the same DDR4 or is it a different dim type with a slot in a different spot?
Y’all probably stick with 3200 and then just whichever highest gig stick I can populate eight slots and stay around under $1,000
Actually have eight slots of ECC from a 45-drive server I have to go look for that it’s been on my shelf for years unusable I think I even put on eBay once and it didn’t sell I don’t remember what it is though maybe I’m getting lucky and it will fit
OK, for US $1000 you’ll probably be looking at 512GB (8x64GB). You can probably get it a few hundred cheaper than that, but you probably can’t get 8x128GB for near that.
So I found my RAM I have eight sticks that came out of a 45 drive server there’s four Samsung and four crucial and I remember at the time they said it doesn’t matter that they match so they can be installed and the system doesn’t care that they are different brands
Adding two photos here I have no idea if these are compatible with third gen epic
Those are DDR4 RDIMMs, so they should work. But they are of mixed speeds, 2933 and 2666 MT/s. Not sure about the other four, but from those four all your RAM will run at the slowest speed, 2666 MT/s. So, it depends on your budget vs performance. You’ll get a 20% boost in RAM-intensive workloads if you get a new set of 3200 MT/s.
Yeah I think what happened was I had the lower speed ones and they didn’t have those in stock so they sent me the higher speeds knowing they’ll just negotiate down
Yeah I think I’ll just sell those and get some 3200
I have my eye on an OWC kit why because they’re blue I don’t know the Samsung micron everything else just looks the same lol And I trust the OWC brand
The last thing I’m trying to figure out is which kit
I see like two identical 256 gig kits the only difference is one is
2rx4. The other is 4rx4. And I know that those are different quad ranks but I don’t know what is better or compatible
I think 2Rx4 is fine. That seems to be what is typical for 32GB RDIMM capacity.
For the same DDR4 memory speed and DIMM type, more ranks will typically increase the loaded latency. While more ranks on the channel give the memory controller a greater capability to parallelize the processing of memory requests and reduce the size of request queues, it also requires the controller to issue more refresh commands. The benefits of greater parallelizing outweighs the penalty of the additional refresh cycles up to four ranks. The net result is a slight reduction in loaded latencies for two to four ranks on a channel. With more than four ranks on a channel there is a slight increase in loaded latency. https://www.dasher.com/server-memory-rdimm-vs-lrdimm-and-when-to-use-them/
I’m not seeing a 4Rx4 OWC variant. I only see that for OWC 32GB LRDIMMs and for higher capacities like 128GB. Doesn’t mean it’s not a thing, just I didn’t see it on a quick search.
