So they are at parity with DDR4 now ... It seems like they are dragging their feet. DDR5 with 64Gb memory dies would be more inline with the next gen replacement.
I'm going to need a fact check on that one. IIRC, the largest DDR4 dies are 16Gb, and DDR5 is at 24Gb. There is no 32 Gb DDR4 die.
You may be confusing Gb (gigabit) with GB (gigabyte). This development means that instead of 48 GB consumer DDR5 modules, we can have 64 GB in 1-2 years.
There are some 2 DIMM per channel Epyc 9004 motherboard which would permit 24 TB per socket. A dual socket board would double that to 48 TB. The Xeon side still supports quad and octo socket topologies which boost maximum capacities higher even with the number of channels less per socket. An octosocket Sapphire Rapids can hit 128 TB in a single logical system via its own memory controllers. CLX memory expanders do work but not officially supported by AMD and Intel on their current generation. The next wave of products should formalize CLX memory support to further boost memory capacities.
While that seems like a lot, systems are quickly approaching a nested page limitation of 256 TB of memory (48 bit addressing mode). On the hardware side of things, support for an additional paging layer for 56 bit addressing does exist but I’m uncertain of its adoption.
It's a good option for expansion, and when modules exist, AMD will target them in next cpu. its always good to see bigger and better, even if they outgrew what we handle right now. I believe this enables us to use 6TB of ram in 1U form server, but I cannot double-check it. I hope PC's will get more as well, as 16GB on everything is very low already...
That is the states official maximum but there doesn’t appear to be any artificial limitation on the Epyc 9004 series. This is likely due to AMD not having access to 1 TB memory for validation/testing at the time of Epyc 9004’s release. They should work. It definitely test before deployment or see if they appear on the OEM’s validates list for the motherboard (which should be done even for 6 TB/1 DIMM per channel setups for the same reason).
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Soulkeeper - Saturday, September 2, 2023 - link
So they are at parity with DDR4 now ...It seems like they are dragging their feet. DDR5 with 64Gb memory dies would be more inline with the next gen replacement.
nandnandnand - Sunday, September 3, 2023 - link
"So they are at parity with DDR4 now ..."I'm going to need a fact check on that one. IIRC, the largest DDR4 dies are 16Gb, and DDR5 is at 24Gb. There is no 32 Gb DDR4 die.
You may be confusing Gb (gigabit) with GB (gigabyte). This development means that instead of 48 GB consumer DDR5 modules, we can have 64 GB in 1-2 years.
Kevin G - Sunday, September 3, 2023 - link
There are some 2 DIMM per channel Epyc 9004 motherboard which would permit 24 TB per socket. A dual socket board would double that to 48 TB. The Xeon side still supports quad and octo socket topologies which boost maximum capacities higher even with the number of channels less per socket. An octosocket Sapphire Rapids can hit 128 TB in a single logical system via its own memory controllers. CLX memory expanders do work but not officially supported by AMD and Intel on their current generation. The next wave of products should formalize CLX memory support to further boost memory capacities.While that seems like a lot, systems are quickly approaching a nested page limitation of 256 TB of memory (48 bit addressing mode). On the hardware side of things, support for an additional paging layer for 56 bit addressing does exist but I’m uncertain of its adoption.
torbendalum - Monday, September 4, 2023 - link
Epyc 9004 only support 6TB per socket, so bigger memory modules would not allow you to have more memmory.deil - Monday, September 4, 2023 - link
It's a good option for expansion, and when modules exist, AMD will target them in next cpu.its always good to see bigger and better, even if they outgrew what we handle right now.
I believe this enables us to use 6TB of ram in 1U form server, but I cannot double-check it.
I hope PC's will get more as well, as 16GB on everything is very low already...
Kevin G - Tuesday, September 5, 2023 - link
That is the states official maximum but there doesn’t appear to be any artificial limitation on the Epyc 9004 series. This is likely due to AMD not having access to 1 TB memory for validation/testing at the time of Epyc 9004’s release. They should work. It definitely test before deployment or see if they appear on the OEM’s validates list for the motherboard (which should be done even for 6 TB/1 DIMM per channel setups for the same reason).