Fremont, Calif.--June 23, 1997--SMART Modular Technologies Inc. (Fremont, Calif.) announced high-density memory-module support for legacy computer systems--larger systems originally designed with 72-pin SIMM memory sockets on the motherboard.
The legacy support is mandated for larger computer systems that have been in service for several years and are now in need of memory upgrade to deal with the data throughput surge resulting from Internet and World Wide Web popularity.
SMART's legacy DRAM modules are immediately available in a range of densities from 16 Mbytes to 128 Mbytes, with parity available as an option in each density. The 72-pin legacy DRAM modules offer OEMs and end-users choices based on physical size, system loading, and the cost of either 16-Mbit or 64-Mbit DRAM chips to achieve the desired density up to 128 Mbytes. The 128-Mbyte 72-pin SIMM modules are priced at $7 and $8 per Mbyte for 16 Mbit- and 64 Mbit-based DRAM modules respectively.
The 72-pin legacy modules based on 16-Mbit DRAMs have been extended to as much as 128 Mbytes per 72-pin module with three mechanical versions: an oversized module with a stacked version that actually combines two modules, but still fits a 72-pin socket; and a rigid-flex version, the equivalent of two modules with a single 72-pin edge connector.
Modules based on 64-Mbit DRAMs are standard size, except for the height which may be extended. These physical size and configuration options ensure DRAM upgrade support for virtually any legacy computer system in need of additional memory.
Because these older machines do not have 168-pin sockets, this physical constraint dictates that any memory upgrade be achieved with 72-pin SIMMs. Although SMART's memory upgrade for legacy computer systems can be achieved with either 16-Mbit or 64-Mbit chips, the 64-Mbit chip is dominantly a 3-V device, and the 72-pin socket traditionally has been a 5-V application.
The SMART legacy memory modules resolve the voltage issue with voltage translators that convert all signals to the 64-Mbit devices to 3 V to prevent device damage, making the voltage difference transparent to the motherboard. This makes it possible to use the general market 3-V 64-Mbit parts in legacy modules that operate at 5 V.
The 64-Mbit DRAM-based 72-pin SIMMs will cost more than legacy modules based on 16-Mbit DRAMs until the price differential between 16-Mbit and 64-Mbit DRAMs decreases enough below crossover to offset the cost of voltage translation on the 64 Mbit-based SIMMs.
SMART Modular Technologies
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