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DDR4 RAM Buy or OC for 3200 ECC unbuffered?

Looking around for 3200GHz spec ECC unbuffered RAM for a new build and there doesn’t seem to be many options available.

I’ve located MTA18ASF4G72AZ-3G2B1 but that’s 32GB per stick which tbh means 64GB to benefit from dual channel see from a local retailer.

I’ve also come across ME25600-628K02-G from NEMIX

Not familiar with NEMIX and reading isn’t helping my confidence about importing into Ireland (EU) and potentially having to ship back if there are any issues.

I’ve located the part number for a 16GB version of the Micro RAM available locally -

And of course as soon as I put together this post, I managed to enter the right part number into a local distributor -

Course that’s not available for about 2 weeks, so if anyone is aware of other part numbers from manufacturers that match my preferred specs I would be very grateful if you could share them.

The alternative I’m considering is whether it’s just better to try and purchase some memory that is known to overclock to the desired speed? I’m planning on a Ryzen 5 3600 (or better) coupled with an X570 board. I’m guessing if I need to go this route instead, will definitely want a better cooler for the CPU assuming it has some impact with multipliers. Though I’m guessing it might disable CPU boost speeds doing this unless the OC memory lines up with a particular clock speed?

Adding the product numbers found here to help anyone searching:

  • M391A2K43DB1-CWE - Samsung
  • MTA18ADF2G72AZ-3G2E1 - Micron
  • KSM32ED8/16ME - Kingston

I don’t think you’ll be able to find any ECC known to overclock well. You might be able to get 2,666 MHz up to 3,000 MHz or close to it, but more than that is doubtful.

So if you really want that 3,200 MHz then get the RAM spec’d for it.

It’s my opinion but I think the main problem is the RAM chips are picked over by the manufacturers and the high speed chips are binned for gaming RAM. The leftovers are used for everything else including ECC/server RAM.

I have used 16 x Samsung 32 GB DDR4-2666 UDIMMs in various X470 and X570 builds over the past year and every one of these builds works with [email protected] at 1.20 V and default Auto-Timings.

I’ve also been looking for faster ECC UDIMMs for quite a while.

When checking listings it seems Micron’s 32 GB DDR4-3200 ECC UDIMMs (MTA18ASF4G72AZ-3G2B1) will be the first to be generally available in Europe (will get a pair as soon as they are really shipping).

I had also tested Crucial 16 GB DDR4-2666 ECC UDIMMs, they wouldn’t even run at DDR4-2933 with 1.35 V.

Personal opnion based on the six years of DDR4 purchases: Samsung’s the best for DRAM (and SSDs).

Dont bother, it works but might not hit rated spec.

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Thanks, it’s my preference to avoid needing to OC to get decent speeds from the memory, though I have been reading some people are having success with particular batches

Subscribed to the referenced topic. Looking up the Samsung 32GB model has led me to the 16GB model M391A2K43DB1-CWE so I’ll start searching for that as well.

Any particular reason to want/need the high speed RAM? The CPU itself will work just fine with even generic cheapo 2133mhz RAM, as it will run and boost at the correct speeds. If that is your worry then that depends more on whether your motherboard’s VRM and your CPU cooling is up to task, not the speed of the RAM used.

As I’m using ECC I don’t expect there where be any special XMP combinations so I won’t benefit in trying to match memory to motherboard which can have an impact as described at

Instead it’ll probably be limited to raw latency improvements based on where the 2666MHz memory I was looking at is CL19 and the 3200MHz is CL22 based on which lines up with a best case scenario of up to 3.5% improvement for memory bound operations. Which I’ll grant you is not exactly going to line up with average usage.

I do a lot of local compiling using ramdisk storage rather than disk storage on my PC, so the relatively small benefit will have a more noticeable impact for local builds for me than I’d expect for general gaming. I expect to be using up to ~10GB of memory for certain builds. Additionally the rest of the time as I’m using Linux, which is fairly aggressive in memory use for caching files, it does tend to give a decent benefit for things that involve lots of reads on the same set of files provided there is enough memory to just keep reading files into RAM.

So I’d concur, this isn’t necessarily something that everyone should follow, it’ll depend on usage. I’m not sure if Windows does the same level of caching files in memory that Linux does, it may well do so but hide it in the memory usage figures since as applications need more memory the OS can just discard pages that were in use for a file cache to allow more memory to be consumed. So not always necessary to show that it’s being used by the OS to speed file reads up.

Turns out I missed an existing topic on this 16GB ECC UDIMMs in a time of Ryzen 3000