Memory Module Types
30 Pin SIMM
The 30 Pin SIMM was the first generation of the SIMM memory family.
They
are typically found in older Intel 286 and 386 desktop computer
systems. They come in both 8 bit and 9 bit (parity) configurations,
with memory ranges of 256K to 8 megabyte, 60ns to 80ns and are 5 Volts
only. The DRAM types supported are mostly Page Mode and Nibble Mode
DRAM which comes in both DIP, PLCC and SOJ packages.
72 Pin SIMM
The 72 Pin SIMM was the second generation of the SIMM family.
They
are typically found in the Intel 486, 486DX, 586 and some early Pentium
desktop computer systems. They come in both 32 bit and 36 bit (parity)
configurations, with memory ranges of 4, 8, 16 and 32 megabytes. These
were normally produced in two voltage, 5V and 3.3V, and theirs speeds
ranged from 60ns to 70ns.
168 Pin DIMM
The 168 PIN DIMM is what is found in most desktop computers today.
Early
on there were three memory types offered in the 168 Pin DIMM form
factor, FPM, EDO and Synchronous DRAM (SDRAM). Their configurations
include 64bit, 72bit and 80Bit, ECC and Non-ECC, and memory sizes
included 16, 32, 64, 128, 256, 512 and 1,024 megabytes. Available
voltages included 3.3v and 5v for FPM and EDO, and 3.3v for SDRAM.
72 Pin SODIMM
72
Pin SODIMM's are typically found in Pentium II Laptop computer. They
come in 64 bit configurations, with memory ranges of 8, 16 and 32
megabyte. These modules are designed around lower power consumption and
only one voltage is offered, FPM and EDO at 3.3v. FPM and EDO are the
standard DRAM types offered and the packaging is referred to as SOJ.
144 Pin SODIMM
144
Pin SODIMM's are typically used in PC 66 and PC 100 SDRAM Laptop
compatible computers. It comes in both 64 bit and 72bit ECC versions
and the memory ranges were 16 to 256 megabyte. The SDRAM chips used in
144 Pin SODIMM's are typically SDRAM in the form of TSOP packaging and
available in 3.3v only.
100 Pin DIMM
100
Pin DIMMs are primarily used in printers. It comes in both 64 bit and
72bit ECC configurations, and is available in memory ranges of 16 to
128 megabytes. The SDRAM chips used on the 100 Pin DIMM are typically
SDRAM in TSOP packaging. Both FPM and EDO were/are used in 100 Pin DIMM.
184 Pin RIMM
The
184 pin RIMM is used on motherboards using the latest Intel i820/i840
chipsets and is referred to as Rambus. The 184 pin RIMM module comes in
both 16bit and 18bit ECC configurations, operating frequencies of
600MHz, 700MHz and 800 MHz and are available with memory ranges of 64
through 512 megabytes. The Rambus packaging is referred to as the Ball
Grid Array (BGA) form factor. The Rambus modules only require 2.5
volts. There is a 1 GHz Rambus chip under development that was slated
for release in 2001.
184 Pin DIMM
DDR
SDRAM is the newest of the memory types under development that will be
available in the 184 Pin DIMM form factor. The principle difference
between conventional SDRAM and DDR SDRAM is its ability to read/write
data on both edges of a clock, therefore resulting in faster data
transfer. DDR SDRAM will be available in two frequencies, 200Mhz and
266Mhz, and operational voltage is 2.5v. There is speculation (these
have not been released to manufacturing as of this writing) that these
modules will be available in both 64 bit and 72bit ECC configurations,
with memory ranges of 64 megabytes through to 1 gigabyte. The DDR SDRAM
chips used are of the TSOP package.
200 Pin SODIMM
The
200 Pin SODIMM module comes in both 64 bit and 72bit ECC
configurations, with memory ranges of 64 megabyte through 512 megabyte.
DDR SODIMM modules are slated for use in next-generation DDR Laptop
applications. The DDR SDRAM chips used on the 200 DIMM are typically in
TSOP packaging.
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