LRDIMM not targeting below 32GB
Another point to mention is that LRDIMMs will NOT be sold below 32GB LRDIMM sizes.
This is because (listen to the IDF conference on LRDIMMs on Inphi blog main webpage) HP/Samsung will not be pushing 16GB LRDIMMs - because they underperform the new 16GB RDIMMs that are 2-rank (use 4Gbit DRAM dies).
And will focus on the 32GB LRDIMMs - which outperform the 32GB RDIMMs (which will continue to be 4-rank until availability of 8Gbit DRAM dies a few years later).
For this reason HP/Samsung suggested they would target 32GB LRDIMM market only.
Since even these 16GB 2-rank RDIMMs (based on 4Gbit DRAM dies) experience slowdown - they run at:
1 DPC @ 1333MHz
2 DPC @ 1333MHz
3 DPC @ 800MHz
There will essentially be no competitor for NLST HyperCloud - which can deliver:
1 DPC @ 1333MHz
2 DPC @ 1333MHz
3 DPC @ 1333MHz
For the 8GB, 16GB and 32GB HyperCloud sizes.
In addition, it seems LRDIMMs cannot deliver 768GB @ 1333MHz - but instead do 768GB @ 1066MHz (see the link below) - which is worse than the NLST performance of 768GB @ 1333MHz.
Compare Inphi LRDIMM presentation:
http://www.serverbladesummit.com/English/Collaterals/Proceedings/2011/20111129_S2-101_Kuppahalli.pdf
vs. NLST presentation:
http://www.netlist.com/products/ppt/HyperCloud_32GB_112011.pdf
For an explanation of these issues see this thread - which discusses this performance shortfall as well as LRDIMM absence from the below-32GB space:
http://messages.finance.yahoo.com/Stocks_%28A_to_Z%29/Stocks_N/threadview?m=te&bn=51443&tid=40867&mid=40951&tof=5&frt=2#40951
Re: NLST vs IPHI 10-Dec-11 08:00 pm
http://messages.finance.yahoo.com/Stocks_%28A_to_Z%29/Stocks_N/threadview?m=te&bn=51443&tid=40867&mid=40954&tof=1&frt=2#40954
Re: NLST vs IPHI .. 32GB LRDIMM speed slowdown 11-Dec-11 12:10 am
http://messages.finance.yahoo.com/Stocks_%28A_to_Z%29/Stocks_N/threadview?m=te&bn=51443&tid=40867&mid=40955&tof=1&frt=2#40955
Re: NLST vs IPHI .. LRDIMM no-show at 16GB, 8GB 11-Dec-11 12:35 am