64GB LRDIMM DDR3 ECC ram for $20 or less

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wildpig1234

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Aug 22, 2016
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which MB is that? quad cpu?

Time to fill it up to have 2TB ;). my supermicro board only go up to 1.5TB... lol..
 
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sl12

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Is it possible to install 16 DIMMs 8R4 in HP x360 G8 ? As I know only 8 ranks per chanel accepted.
 
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Himay

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Apr 19, 2016
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Is it possible to install 16 DIMMs 8R4 in HP x360 G8 ? As I know only 8 ranks per chanel accepted.
My understanding is each memory channel in the E5-2400/2600 v2 CPU generation can support 8 ranks. 8R LRDIMMs present at 4 ranks each (load-reduced present as 4 to the CPU), so you'd only be able to populate each memory channel of each CPU with 2 of these 8R LRDIMMs.
 

wildpig1234

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My understanding is each memory channel in the E5-2400/2600 v2 CPU generation can support 8 ranks. 8R LRDIMMs present at 4 ranks each (load-reduced present as 4 to the CPU), so you'd only be able to populate each memory channel of each CPU with 2 of these 8R LRDIMMs.
So only 1TB for a dual cpu or 512GB for single CPU? Wondering why supermicro has MB with 3 dimms per channel for up to 1.5TB for dual 2011 cpu.
 
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Himay

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So only 1TB for a dual cpu or 512GB for single CPU? Wondering why supermicro has MB with 3 dimms per channel for up to 1.5TB for dual 2011 cpu.
I guess it depends on how many channels the memory slots are setup in? https://www.supermicro.com/support/resources/memory/X9_DP_memory_config_socket_R.pdf

My R320 only provides 3 channels over 6 slots, so the manual states 192GB is the max (6x4R RDIMMs presenting as 4R each) but it should in theory accept 6x8R LRDIMMs (presents as 4R each as load-reduced).
 

Himay

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This has me really tempted to put in a 6x bid to take my R320 from 6x8GB to :eek:

EDIT: Oops, no best offers on this one…
 
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Samir

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Dammit it cannot be two days in a row that the STH gets me...I do not need to test if my z420 can hit 512GB...I do not need to test if my z420 can hit 512GB...I do not need to test if my z420 can hit 512GB...

And actually I wonder if they would even work. There are currently 8x 32GB LRDIMMs each 4Rx4. The spec sheet says it can handle 384GB and 4 channels, so must be one slot on each side of the processor that make up a channel:

I wonder if this is a real limit or just one from 'back in the day' since there was nothing to test, and I wonder if an 8Rx4 module will even work and when it does, would it prevent another module in the same channel or not since that would exceed 96GB (384GB/4 channels). At $160, it's a steep cost to do it 'for science'. I'll have to wait until these modules are cheaper to try it.
 

wildpig1234

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Aug 22, 2016
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make sure your MB will actually support LRDIMM before going crazy on this.... lol.. Many do not support LRDIMM. case is my Lenovo D30 which i learn to my real surprise and disappointment that it does not support LRDIMM
 
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wildpig1234

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Dammit it cannot be two days in a row that the STH gets me...I do not need to test if my z420 can hit 512GB...I do not need to test if my z420 can hit 512GB...I do not need to test if my z420 can hit 512GB...

And actually I wonder if they would even work. There are currently 8x 32GB LRDIMMs each 4Rx4. The spec sheet says it can handle 384GB and 4 channels, so must be one slot on each side of the processor that make up a channel:

I wonder if this is a real limit or just one from 'back in the day' since there was nothing to test, and I wonder if an 8Rx4 module will even work and when it does, would it prevent another module in the same channel or not since that would exceed 96GB (384GB/4 channels). At $160, it's a steep cost to do it 'for science'. I'll have to wait until these modules are cheaper to try it.
I am actually surprised that the Z420 would even support LRdimm. That cpu of yours says only support up to 384GB. the e5 v2 cpus intel says support up to 768GB. I haven't seen any MB for 2011 v2 with more than 768GB/cpu. So maybe intel really meant it in their specs?
 
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zachj

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Apr 17, 2019
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My z420 and z620 started acting funny…they both got the gremlins out of nowhere.

so I got rid of them last year.

but I too was really curious if the z420 would support 512gb of lrdimms. I really hope you try it and report your findings. I know z420 supports 256gb or regular rdimm.
 

Samir

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I am actually surprised that the Z420 would even support LRdimm. That cpu of yours says only support up to 384GB. the e5 v2 cpus intel says support up to 768GB. I haven't seen any MB for 2011 v2 with more than 768GB/cpu. So maybe intel really meant it in their specs?
The z420 wasn't even supposed to support ecc reg, lol. I found out by accident when I tried some 32GB LRDIMMs and it booted. I then ran memtest and it passed. Apparently I set the world record at 256GB for a z420 when I did this. :) What's interesting is that the v2 processors apparently dropped LRDIMM support, at least on the z420 when someone trying to replicate my setup ran into a problem with just beeps. The modules were the exact same part number as mine, known working, but his still wouldn't boot with them even though RDIMMs would. We then saw in the spec sheets how LRDIMM support was removed in v2, or at least that's what I recall now.

It is interesting the v2 says 768GB though--I guess the number of ranks allowed in a channel must have doubled--so instead of just 96GB, there is a total of 192GB possible in a channel and that would be achievable via 6x memory slots with 32GB modules or just 3x slots with 64GB modules, but then those would have to be LRDIMMs. with just regular RDIMMs, you'd need 24 memory slots to get 768GB and for a dual processor system to max out at 1.5TB, a whopping 48 memory slots, which I don't think exists.

I have no doubt that the memory limit on my e5-2630L v1 might be real, but now I'm wondering is how I can hit that 384GB number? A 64GB 8Rx4 module and a 32GB 4Rx4 module together would total 96GB in a single channel, but that means that the number of ranks supported by the processor has to be 12 vs 8. And 12 is a bit of an oddball number so I wonder if it is more like 16, which would allow 128GB per channel. Only one way to find out, but it's too pricey right now 'for science!'
 
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Samir

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My z420 and z620 started acting funny…they both got the gremlins out of nowhere.

so I got rid of them last year.

but I too was really curious if the z420 would support 512gb of lrdimms. I really hope you try it and report your findings. I know z420 supports 256gb or regular rdimm.
Yeah, there's a certain point where motherboards will wear. Luckily I haven't had any issues so far, but I also haven't pushed it at all like I originally planned.

I'm pretty curious too as the machine wasn't even supposed to support RDIMMs or LRDIMMs at all.
 
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zachj

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Apr 17, 2019
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The z420 wasn't even supposed to support ecc reg, lol. I found out by accident when I tried some 32GB LRDIMMs and it booted. I then ran memtest and it passed. Apparently I set the world record at 256GB for a z420 when I did this. :) What's interesting is that the v2 processors apparently dropped LRDIMM support, at least on the z420 when someone trying to replicate my setup ran into a problem with just beeps. The modules were the exact same part number as mine, known working, but his still wouldn't boot with them even though RDIMMs would. We then saw in the spec sheets how LRDIMM support was removed in v2, or at least that's what I recall now.

It is interesting the v2 says 768GB though--I guess the number of ranks allowed in a channel must have doubled--so instead of just 96GB, there is a total of 192GB possible in a channel and that would be achievable via 6x memory slots with 32GB modules or just 3x slots with 64GB modules, but then those would have to be LRDIMMs. with just regular RDIMMs, you'd need 24 memory slots to get 768GB and for a dual processor system to max out at 1.5TB, a whopping 48 memory slots, which I don't think exists.

I have no doubt that the memory limit on my e5-2630L v1 might be real, but now I'm wondering is how I can hit that 384GB number? A 64GB 8Rx4 module and a 32GB 4Rx4 module together would total 96GB in a single channel, but that means that the number of ranks supported by the processor has to be 12 vs 8. And 12 is a bit of an oddball number so I wonder if it is more like 16, which would allow 128GB per channel. Only one way to find out, but it's too pricey right now 'for science!'
Without bothering to reference ARK I’m pretty sure the e5-2600 v2 series supports lrdimms whereas the e5-1600 v2 does not.