Tag Archives: IBM

Memory choices for the IBM System x3300 M4

Reverting to 3 memory channels per processor – max at 2 DPC

Thanks to Daniel Bowers for clarifying the use of “socket B” Xeon E5-2400 processors in this server.

IBM has announced the x3300 M4 servers – which are 2-socket servers containing 12 DIMM slots.

The 12 DIMM slots suggest these are running at 3 memory channels per processor (as opposed to the 4 memory channel Romley processors seen so far on this blog). And maximum memory capacity is at 2 DPC.

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Latency and throughput figures for LRDIMMs emerge

LRDIMMs exhibit 45% worse latency and 36.7% worse throughput at 3 DPC

LRDIMMs (which are a new standard and incompatible with DDR3 RDIMMs) exhibit significant performance impairment at 3 DPC compared to RDIMM-compatible HCDIMMs:

– LRDIMMs have 45% worse latency than HCDIMMs (235ns vs. 161.9ns for HCDIMMs)
– LRDIMMs have 36.7% worse throughput than HCDIMMs (40.4GB/s vs. 63.9GB/s for HCDIMMs)

And this is when HCDIMMs are run at a SLOWED down 1066MHz at 3 DPC (in order to match the lower max achievable speed of the LRDIMMs).

This comparison – at SAME speed – highlights the architectural weaknesses of the LRDIMM design irrespective of the speeds.

When compared at the MAXIMUM achievable speeds (LRDIMMs at 1066MHz at 3 DPC and HCDIMM at 1333MHz at 3 DPC):

– LRDIMMs have approx. 45% worse latency than HCDIMMs (235ns vs. 161.9ns for HCDIMMs)
– LRDIMMs have 40% worse throughput than HCDIMMs (40.4GB/s vs. 68.1GB/s for HCDIMMs)

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HyperCloud branding should suggest a better RDIMM

A reader commented on a problem that end-users face when presented with HyperCloud as a solution – firstly that it is not qualified on the server that THEY use, and secondly that the HyperCloud naming/posturing is not immediately suggestive of an RDIMM-compatible product which may have made them consider it even though it was not qualified on their server.

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VLP RDIMMs for virtualization on Blade Servers

Why Netlist 16GB VLP RDIMM outperforms the competition

UPDATE: 07/06/2012 – VMware certifies Netlist as sole memory vendor

Netlist claims their 16GB VLP RDIMM has improved performance and reliability/robustness vs. the competitors’ products. And is also cheaper to make.

VMware has certified Netlist 16GB VLP RDIMM memory modules for use with VMware products – it is the only VLP memory product certified by VMware.

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Memory for VMware virtualization servers

VMware certification limited to Netlist HyperCloud and VLP only

Netlist becomes the only memory certified by VMware on it’s virtualization products.

I cannot find a VMware testimonial in favor of LRDIMMs.

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Market opportunity for load reduction

Industry estimates of “attach rates”

UPDATE: added 06/19/2012: IDTI comments
UPDATE: added 06/22/2012: analysts on attach rates
UPDATE: added 07/03/2012: Netlist conservative $500M revenue estimate
UPDATE: added 07/03/2012: Netlist conservative $7.5B revenue estimate for 2014
UPDATE: added 07/04/2012: isuppli.com on LRDIMM market

For DDR3, load reduction is essential at:

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LRDIMMs future and end-user risk factors

LRDIMMs validated by JEDEC without licensing relevant IP

LRDIMMs are based on a single-sourced “iMB” buffer chipset from Inphi (more on that below).

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