Are you using this case with x9dri-LNF4+? How does it fit? I am thinking to get one.
64GB LRDIMM DDR3 ECC ram for $20 or less
- Thread starter wildpig1234
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Any docs on whether it supports 24x 64GB? The original docs I found say it only supports 32GB DIMMs for a max of 768GB.
Maybe it should if CPU says it supports 1.5T? What's your CPU you intend to use?
I remember a funny story when first gen i7 came out it was listed as max 16g. At the time 8GB DDR3 sticks were still in early adoption or not even existed yet. Few years after purchase I got my hands on 8G sticks and installed all 4, and that was over the official intel spec. And it worked flawlessly with up to a year of uptime, under moderate load, definitely 16G was in use most of the time.
I remember a funny story when first gen i7 came out it was listed as max 16g. At the time 8GB DDR3 sticks were still in early adoption or not even existed yet. Few years after purchase I got my hands on 8G sticks and installed all 4, and that was over the official intel spec. And it worked flawlessly with up to a year of uptime, under moderate load, definitely 16G was in use most of the time.
I snagged Cisco UCS C240 M3 Rack Server Intel Xeon E5-2609 v2 x 2 12GB RAM No HDDs | eBay which came with 2x E5-2609v2. According to Intel the CPU supports a max of 768GB Intel® Xeon® Processor E5-2609 v2 (10M Cache, 2.50 GHz) - Product Specifications | Intel which hopefully means per socket?
you’re constrained by max supported ram as declared by intel and you’re also constrained by max number of ranks per channel.
Boards with 24 dimm slots are 3DPC and have the unfortunate ability to let you install memory in excess of the limits on ranks per channel.
on the hp z420 you could exceed the limit on ranks even with only 2DPC by trying to install 2 x 32gb rdimm.
Any way to verify such limits? If Intel lists the E5-2609 v2 as supporting 768GB over 4 channels, that clearly means the CPU supports 64GB DIMMs, right? Unless this figure is referring to the max total across two sockets. Besides that the only foreseeable issue would be with the MB rather than CPU.
I don't know specifics here but 768GB could be achieved with 3DPC x 4 channels x 32GB DIMMs as well
Haha you're right, this is early morning not enough coffee math lolYes but only with 2 sockets as I said. 3*4*32=384
768gb on the v2 Xeon would only be possible using 64gb lr-dimms.
This answers all your questions: https://sp.ts.fujitsu.com/dmsp/Publications/public/wp-ivy-bridge-ep-memory-performance-ww-en.pdf
The ddr3 spec only supports 8 ranks per channel.
This answers all your questions: https://sp.ts.fujitsu.com/dmsp/Publications/public/wp-ivy-bridge-ep-memory-performance-ww-en.pdf
The ddr3 spec only supports 8 ranks per channel.
Actually, I only have one question, which is "Does this server I got (Cisco UCS C240 M3 Rack Server Intel Xeon E5-2609 v2 x 2 12GB RAM No HDDs | eBay) support 24x 64GB LRDIMMs?"
The doc you linked states that LRDIMMs would be supported using virtual rank reduction:
So 12 LRDIMMs with 8 physical ranks each could be mapped into only 24 logical ranks, i.e. 6 ranks per channel.
If Cisco doesn’t block you yes. Bear in mind some of the other posts in that thread saying some boards get funky with 1TB+ (ex: not loading gpu at boot).
I was able to successfully run 1.5TB ram with 2696 v2 and this lrdimm on supermicro x9dri MB
Asus Z9PED16 official specs is only up to 512GB ram. But it accepted the 64GB lrdimm and worked fine with 1TB ram. I verified this personally using the 2696 v2 cpus.
Nicely done!
Thank you for running these tests! Sounds like there's not enough ranks or else you should have been able to add another 64GB module. With 4x 32GB modules in each bank, each being 4 ranks, I've got 16 ranks--the same as your 2x 64GB modules at 8 ranks each. I don't have any extra slots for memory, but it seems like that doesn't matter as you couldn't get another module to work (which presented 24 ranks to the cpu).
I was curious about the v2 LRDIMMs support drop as I only worked with that one individual so it could have been a fluke, but you've proven that it's a real issue on the z420 for sure. v1 cpus only if one wants 256GB of RAM. I run an E5-2630L as that's what came in it.
is there any specific setting you used? on bios what does the RAM config say?
No specific settings. Just loaded up all slots with the 64GB dimms. Bios did say 1.5TB. I used y cruncher to calculate pi out to like 250billion digits all in ram only.
You have problem getting it to work?
I have 250gb ram and even though they are 1600mhz, bios will say they are operating 1333mhz and if I add more, it will even go down to 800mhz. And the RAMs are running in independent mode. I am running X9DRI-LNF4. Are you getting full RAM speed?
That is known. And yes, the more i populate the rams, the slower the speed. If you find a setting that restore the full speed, I think everyone here would really be interested.
But i do believe that one quirk of these older MB is that the more ram you have the slower they get