New Load-Reduced Module Form Factor Triples Memory Capacity and Improves Bandwidth by 57 Percent Over Standard Registered Modules

Micron Technology, Inc. (NYSE:MU) today announced that it has produced the industry’s first DDR3 load-reduced, dual-inline memory module (LRDIMM) and will begin sampling 16-gigabyte (GB) versions this fall. By reducing load on the server memory bus, Micron’s LRDIMMs provide the option to support higher data frequencies and significantly increase memory capacity.

The new LRDIMMs will be manufactured using Micron’s leading-edge 1.35-volt, 2-gigabit (Gb) 50-nanometer DDR3 memory chips, allowing the company to easily and cost-effectively increase server module capacity because of the chips’ high-density and industry-leading small die size. Micron’s 2Gb 50nm DDR3 product is currently in qualification with customers and is ramping toward high volume production.

Most midrange enterprise servers today utilize approximately 32GB of DRAM per system but this is expected to more than triple by 2012, according to a recent report from Gartner, Inc. (May 2009). With server manufacturers continuing to take advantage of multi-core processors and data centers opting for efficient virtualization technology, memory requirements are being driven ever higher. By increasing the available memory a server system has, it is able to run more programs concurrently, handle larger data files more efficiently, and generally exhibit better overall system performance.

Micron’s LRDIMMs currently use Inphi’s recently announced isolation memory buffer (iMB) chip in place of a register to reduce the bus load when transferring data between the memory and processor. Micron’s new LRDIMMs reduce this load by 50 percent for a dual-rank module and 75 percent for a quad-rank module, when compared to today’s standard DDR3 server modules – registered DIMMs (RDIMMs). By reducing the load on the bus, Micron’s LRDIMMs enable servers to handle higher frequencies of data to improve overall system performance and support increased number of modules for greater system memory capacity.

Today, using RDIMMs, a typical server system can accommodate up to three quad-rank 16GB RDIMMS per processor. However, that same system can support up to nine quad-rank 16GB LRDIMMS per processor, pushing the memory capacity from 48GB to 144GB. Measuring performance levels, Micron’s 16GB LRDIMM offers an increase of 57 percent in system memory bandwidth, when compared to an RDIMM.