Crucial CUDIMM DDR5-6400 128 GB CL52

[A Computer Guy]

Or you can get their DDR5 ECC UDIMM kits like I did (96 GB). Specwise they're even the same as these CUDIMMs.

Speaking of that did you finally get around to installing them?

 

[azrael]

Speaking of that did you finally get around to installing them?

To my eternal shame, not yet. Had such great hopes for the Easter vacation, but sadly nothing came of it.

 

[qxp]

He followed up by saying it's the job of the data scientist to evaluate the data and find the errors. Even without data corruption, ever set has a chance of the input data being incorrect. - This part I remember exactly "Anyone who blindly trusts their data is a idiot." . Finally, none of them are concerned about a single bit-flip because its not enterprise data. More often than not, its the program that is incorrectly written and not the data being "bad" itself.

Indeed. I would also suggest that you always look at your data - even if you have multiple terabytes, just display random pieces and look at them with your eyes. And then do data quality. And only then analyze.

As for ECC/non-ECC - it does not matter. If you have the money get ECC, but it is more important to have more memory than less. If you have single bit errors from heat or cosmic rays, just run your code three times and compare the results - poor man's ECC. ECC matters more if you are running a server and you don't want applications crashing on rare occasions.

If you have more memory its nice and then you can load your 100GB dataset straight into RAM. But if you don't and you only got a notebook with 16GB you can still do the analysis - just put more thought into your code.

For LLMs I would suggest more than 256GB - latest llama and deepseek models want 700GB or more. If you simply do research and pull up a bunch of papers with PDFs in browser windows you can easily use up 32GB of RAM. Can't wait until AI MAX+ laptops show up with 128GB of RAM, but for now I just swap off SSD.

 

[efikkan]

I'm not going crazy but, does that seriously say CL52???

This is latency in clock cycles, not in time. And as the underlying latencies are relatively fixed, and the clock rates gets higher, the resulting latencies in cycles will increase.

Overall the proportional latency difference between DIMMs with standard voltage and higher voltage has remained relatively stable, but DDR5 has some timings that are worse than DDR4. This may sound like something that would cause serious performance penalties, but the significant bandwidth improvements have proven to offset this for most workloads. (There will be exceptions, of course.) But what we've seen, even with gaming, is that significant advancements in bandwidth are reducing the effective usefulness of memory with tighter timings, and the speed advances are coming fairly rapidly at the moment. With Arrow Lake, Xeon 6 and Epyc(Zen 5) achieving 6400 MHz and some Xeons supporting 8800 MHz MRDIMMs, I don't think it will be long before we see further advancements. The plans for 2nd gen MRDIMM is 12800 MHz and 3rd gen 17600 MHz BTW. I would expect upcoming Nova Lake and Zen 6 / "Zen 7" to push beyond 6400 for CUDIMMs, probably 7200 MHz or higher. It wasn't that long ago DDR4 achieved 3200 MHz at JEDEC speeds…

Also what does someone need 128GB of ram for?

Well, probably not gamers, but anyone who does heavy web browsing and runs various applications can easily fill 64 GB, and with the way things are heading it wouldn't take long before even 96 GB is too little. Whenever you build a system you should configure it with whatever is reasonable for the next few years, so for any "prosumer" I wouldn't recommend less than 128 GB in a new build today.

 

[bluepoint]

Would all that extra ram be a waste if you are only on a dual channel system ? I see it it 96 GB/s on aida64.

I guess my next question is if the cudimm tech can be used with ecc to make ecc unbuffered dimms? If so, 256 GB ecc on a zfs server using a workstation board would be nice instead of having to get the bigger and way more expensive server platform.

would a 200 GB ram disk be useful for anything ? Game level loads ?

Nope.mems got switched to 4 channels on my rider 78HX 13th vi (128GB kit)

 

[igormp]

Nope.mems got switched to 4 channels on my rider 78HX 13th vi (128GB kit)

That's still "dual-channel" in the sense of only having a 128-bit bus. To get more bandwidth out of more sticks, one would need to jump in a HEDT/server platform that actually has more memory channels.