Tag Archives: DIMMs per channel

Memory options for the IBM System x3650 M4 server – 32GB memory modules

For 32GB memory modules – the problem with 32GB RDIMMs

32GB RDIMM will only be available in 4-rank (4-rank).

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Memory options for the IBM System x3650 M4 server – 16GB memory modules

For 16GB memory modules use at 1 DPC and 2 DPC

If the memory you need is going to require 1 DPC, or 2 DPC, you are better off buying the IBM RDIMMs.

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Intel’s need for LRDIMMs on roadmap to DDR4

Virtualization and the need for faster processors and more memory

Developments in virtualization have allowed many servers to be replaced by one server.

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Memory options for the HP DL360p and DL380p servers – 32GB memory modules

For 32GB memory modules – the problem with 32GB RDIMMs

Currently HP does not list a 32GB RDIMM in the docs (although it may still offer it).

http://h18004.www1.hp.com/products/quickspecs/14225_na/14225_na.html
Overview
HP SmartMemory

The reason is that the 32GB RDIMM will only be available in 4-rank (4-rank).

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Memory options for the HP DL360p and DL380p servers – 16GB memory modules

For 16GB memory modules use at 1 DPC and 2 DPC

If the memory you need is going to require 1 DPC, or 2 DPC, you are better off buying the HP Smart Memory RDIMMs.

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Installing memory on 2-socket servers – memory mathematics

Background – 2-sockets, memory channels and DPC

On a 2-socket server (2 processors on the motherboard), each Romley processor has 4 memory channels (up from 3 of pre-Romley). On each memory channel if you use 3 DPC (3 DIMMs per channel) you have:

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The need for high memory loading and it’s impact on bandwidth

The need for high memory loading

The memory you use in your home desktop computer are UDIMMs (unregistered DIMMs).

You often use 2GB or 4GB of memory on such systems.

Memory requirements on servers for virtualization, CAD, in-memory databases, high performance computing are much greater – for example 256GB or 384GB or 768GB in a 2-processor server.

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LRDIMM buffer chipset makers

Who makes LRDIMM buffer chipsets ?

UPDATE: 06/15/2012 – added Inphi comments on competitors
UPDATE: 06/15/2012 – added IDTI comments on Inphi/JEDEC
UPDATE: 06/29/2012 – institutional interest declines
UPDATE: 07/06/2012 – non-viability of LRDIMMs

The same players who make RDIMM buffer chipsets (that are used by memory module makers to make RDIMM memory modules).

LRDIMM buffer chipsets are currently only made by Inphi.

IDTI has prudently (after what you read below) postponed LRDIMMs to end of 2012 (i.e. skipping Romley and targeting the Ivy Bridge series according to their conference call).

Texas Instruments has not been interested in LRDIMMs – possibly related to settlement in Netlist vs. Texas Instruments a couple of years ago.

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Second take

UPDATE: added 06/24/2012: Invensas on LRDIMM design inferiority vs. HyperCloud

Basically LRDIMMs and DDR4 are both going to be using NLST IP.

This article gives a good introduction:

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First the short take

LRDIMMs is at end-of-life and DDR4 is copying NLST IP.

The new Intel Romley virtualization/data center servers from IBM and HP have support for Netlist (NLST) HyperCloud memory.

This is the memory DDR4 is going to copy (license).

LRDIMMs are already copying it – but have implemented it with asymmetrical lines – leading to latency issues – and inability to deliver 1333MHz at 3 DPC.

With HP Smart Memory HyperCloud – you can get 1333MHz at 3 DPC at 24DIMMs on the 2-processor DL360p and DL380p servers.

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