How to manage RAM modules exceeding 32GB
How to manage RAM modules exceeding 32GB
I'm exploring the process of assembling several new PCs. Typically, we rely on popular brands like Intel or AMD, but lately the 128GB RAM limit is proving challenging in some situations. I've been thinking about revisiting AM5 boards, though the manuals suggest they only accommodate up to 128GB of DDR5 memory, which must be unbuffered (either ECC or non-ECC). I'm unsure if buffered and unbuffered mean the same as registered and unregistered. It seems like a technical distinction but essentially similar. RAM specifications usually mention whether they're registered or not, while MB docs specify unbuffered.
Actually, the AM5 platform can handle up to 192GB (four 48GB modules) of DDR5 with a BIOS update, and you can easily find modules up to 32GB. There are also 48GB modules specifically for AM5, possibly expanding support on Intel's mainstream boards in the future. Larger sizes (64GB+) require ECC, buffered, and registered modules. So, I can't use these on AM5.
I might need to switch to a more robust workstation setup—like Threadripper Pro for AMD or an Intel LGA 4677—though I'm not very familiar with them. These would support buffered, registered RAM, which is what I'd expect from mainstream systems. They should still run Windows and standard peripherals. The cost of other parts (CPU, memory) seems to jump significantly. Please confirm if I misunderstood anything or if there are more details you'd like. Thanks in advance for your help.
Best,
-a-
Yep, this might be of help: https://forum.level1techs.com/t/7950x-i-...uck/189825 https://forum.level1techs.com/t/ddr5-4-d...not/197153 (lots of discussion about 192gb on AM5) Intel already supports 48gb modules (in fact, they supported it first). Correct. Yup, you got it right. TR-Pro with its 8 channels of ram (newer models should have 12 channels) would allow you to go past 1TB of ram easily. Keep in mind that you want Threadripper PRO , the non-pro variants have no support for RDIMMs and only have 4 channels, limiting you to 256gb of ram. Intel's lineup is the Xeon-W, the latest models are based on Sapphire Rapids. You can use windows/linux on those without issues, they do support RDIMMs, and yes, the CPUs and MOBOs are way more expensive than the mainstream counterparts.
Intel's support for 48GB modules began early in the year, likely constrained more by available RAM than platform capabilities. The latest 13th generation supports up to 192GB, which requires four 48GB units. Intel offers a current workstation featuring Alder Lake P-cores, significantly more RAM, and PCIe support similar to server CPUs. It remains costly relative to consumer models, but essential for demanding applications.
I checked the UM details for some sWRX8 MB modules. It lists 8 x DIMM, up to 2048GB DDR4 non-ECC, and also supports ECC unbuffered and R-DIMM/LR-DIMM configurations. The memory type, speed, and module count change based on the CPU and setup. It looks like regular (unregistered, non-ECC) DDR4 could work here. From a budget standpoint, this seems appealing since I already have many modules. Would it really be a bad move? I was considering the TRpro 5955WX, but it might be too much for what we need. It would just add more RAM.
They seem uncertain about handling 48GB sticks, and using 32GB would cap you at 256GB. If that works for you, it should be okay (though it might be costly). You might want to check out used RDIMMs on eBay or local used markets—they’re usually affordable. That’s a nice perk, haha!
256GB should suffice until then, and we’d still have the chance to buy bigger RDIMM modules later if needed. Still, most guides I’ve seen suggest using ECC whenever it makes sense, which makes me curious about its importance—particularly when dealing with substantial RAM amounts.
I thought extra CPU wouldn’t help much since the issue was more about memory limits. If doubling your current RAM would suffice, why not try it? How intense is your workload in terms of memory usage? I’m curious if using swap could work as an alternative. Bandwidth would drop significantly, but you’d get large storage at a lower cost. Think about how long the system can handle before needing more memory.
@porina my initial response didn't quite capture what you meant. Our existing configurations have 128GB, which sometimes acts as a constraint (we'd prefer more memory). Increasing it to 256GB would likely suffice for now, until we encounter datasets that keep growing. We could buy the biggest RAM capacity available today (8x256GB ECC), but this might be excessive right now and we might postpone it until we truly need it. If we already have 256GB (8x32 non-ECC) on hand, we should consider this carefully. Of course, we'll evaluate this further when making the purchase. I'm curious whether ECC RAM is necessary given our usage patterns or if standard non-ECC RAM would suffice since it's readily available in our inventory. For now, we haven't tested ECC yet, and I wonder if we're missing something. Our current situation is resource-limited, and RAM has always been the bottleneck—whether it's CPU or disk. When RAM runs out, Windows or applications switch to using the SSD or employ workarounds, which significantly slows things down. Adding more RAM would prevent this issue and greatly improve performance.