Elpida's 4 Gig DDR2 Registered DIMMS offer highest density for volume server and blade apps.

Elpida Memory, Inc. (Elpida), Japan's leading supplier of Dynamic Random Access Memory Dynamic random access memory (DRAM) is a type of random access memory that stores each bit of data in a separate capacitor within an integrated circuit. Since real capacitors leak charge, the information eventually fades unless the capacitor charge is refreshed periodically. (DRAM), today announced the availability of 4 Gigabyte DDR (Double Data Rate) Refers to an SDRAM memory chip that increases performance by doubling the effective data rate of the frontside bus. For more details, see SDRAM.

DDR - Double Data Rate Random Access Memory 2 Registered Dual In-Line Memory Modules (DIMMs) that offer high-density and high-performance benefits for server applications. Elpida's new modules can deliver up to 32 Gigabytes of memory in an eight slot server platform, with system data transfer rates up to 8.4 Gigabytes per second (GB/sec). They also utilize Elpida's unique stacked FBGA FBGA Fine-Pitch Ball Grid Array
FBGA Fine Pitch Bga
FBGA Fine Line Bga (sFBGA) technology to achieve a thinner module--about 30 percent thinner than the current JEDEC The division of the Electronic Industries Alliance (EIA) that deals with semiconductor standards (officially, the JEDEC Solid State Technology Association of EIA). JEDEC was formed in 1958 when the Joint Electron Tube Engineering Council (JETEC) split into two Joint Electron Device standard. The module thinness helps increase air flow between DIMMs and improves thermal performance in server systems.

"4 Gigabyte DDR2 Registered DIMMs provide the highest density available for high volume and server blade applications," said Jun Kitano, director of Technical Marketing for Elpida Memory (USA). "By utilizing sFBGA technology to create a thinner module, Elpida can offer a competitive module solution that also addresses industry demand for improved air flow and thermal characteristics in servers."

Elpida's 4 Gigabyte DDR2 Registered DIMMs (Part numbers: EBE EBE Excédent Brut d'Exploitation (French accounting)
EBE Extraterrestrial Biological Entity
EBE Evidence-Based Education
EBE Electron Beam Evaporation (semi-conductor industry)
EBE e-Business Engineering 41RE4AAHA-5CE; EBE41RE4AAHA-4A-E A-E, AE above-elbow; see under amputation. ) are organized and 512M words x 72-bits x 2 Ranks. The modules are composed of thirty-six pieces of 1 Gigabit DDR2 SDRAM devices stacked using sFBGA technology in 240-pin packages. The stacked packages actually improve module yield because they are based on devices that have already been tested. The unique electrical characteristics of Elpida's package include enough headroom to support higher frequencies for modules based on future generation DDR2 devices. The current generation DDR2 devices mounted on the DIMMs each have a CAS latency (CL) of 3-4-5, a burst length of 4 or 8 and 1.8 Volt operation with a data transfer rate of up to 533 Megabits per second (unit) megabits per second - (Mbps, Mb/s) Millions of bits per second. A unit of data rate. 1 Mb/s = 1,000,000 bits per second (not 1,048,576).

E.g. Ethernet can carry 10 Mbps. (Mbps). This translates to a module data transfer rate of 4.2 GB/sec per channel, or 8.4 GB/sec per system.

Elpida's 4 Gigabyte DDR2 Registered DIMMs (Part numbers: EBE41RE4AAHA-5CE; EBE41RE4AAHA-4A-E) are currently sampling to customers. Volume production is expected in July 2005.

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Title Annotation:	dual in-line memory modules, double data rate, Elpida Memory Inc.
Publication:	EDP Weekly's IT Monitor
Geographic Code:	9JAPA
Date:	Apr 25, 2005
Words:	329
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