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Glossary
Dynamic RAM (DRAM) Memory Technologies
Type
FPM (60,70ns)
EDO (50,60,70ns)
SDRAM (66MHz)
SDRAM (100MHz)
SDRAM (133MHz)
RDRAM (Direct Rambus)
DDR SDRAM (100MHz)
DDR SDRAM (133MHz)
First Used
1990
1994
1996
1998
1999
1999
2000
2000
Clock Rate
25MHz
40MHz
66MHz
100MHz
133MHz
400MHz
100MHz
133MHz
Bus* Width
64 bits
64 bits
64 bits
64 bits
64 bits
16 bits
64 bits
64 bits
Bandwidth
200 MBps
320 MBps
528 MBps
800 MBps
1.1 GBps
1.6 GBps
1.6 GBps
2.1 GBps
Volts
5v
5v
3.3v
3.3v
3.3v
2.5v
3.3v
3.3v
Peak
* Memory channel width (64 bits started with 75MHz Pentium)
Source: Computer Desktop Encyclopedia
example, a modem chipset contains all the primary circuits for transmitting and receiv-
ing data; a PC chipset provides the electronic interfaces between all subsystems.
CMOS (complementary metal-oxide semiconductor)
CMOS is a widely used type of semiconductor, which features high speed and low
power consumption. PCs usually contain a small amount of battery-powered CMOS
memory to retain the date, time, and system setup parameters.
COM
In MS-DOS system, the name of a serial communications port. DOS supports four
serial ports. For example, if a modem is connected to one serial port and a serial mouse
to another, they are identified as COM1 and COM2.
DIMM (dual in-line memory module)
A small circuit board that holds memory chips. A SIMM (single in-line memory
module) has a 32-bit path to the memory chips whereas a DIMM has 64-bit path.
DRAM (Dynamic RAM)
A most common type of computer memory. It usually uses one transistor and a
capacitor to represent a bit. As the development of technology, the memory type and
specification used in computer becomes variety, such as SDRAM, DDR SDRAM, and
RDRAM. For further instruction, please see the table below: