Random Access Memory is an essential part of every PC system RAM stores information temporarily so that it can be used and accessed by the components of the system.
When working with RAM there are two distinct types that you will encounter. Static RAM (SRAM)
and dynamic RAM . SRAM is costly then DRAM is used for cache memory in systems. DRAM which has become very affordable in recent years, is now cheap enough to make it possible to use it in large quantities in PC system.
SIMM(Single Inline Memory Module)- There are two type of SIMMs 30-pin and 72-pin. The 30-pin units, which were introduced first transfer data 8 bit at a time. The 72- pin SIMMs transfer data 32 bits at a time. The 72-Pin SIMMs apart from having 42 pin is 1.25 inches longer then the 30-pin SIMMs at 4.25 inches.
DIMM(Dynamic Inline Memory Module)- Most DIMMs have 168- pin are installed vartically and are secured by cache that engage the module at each end. DIMM use a 64 bits data bus. DDR SD RAM uses 184-pin DIMMs.
MEMORY TYPE-
Fast Page Mode RAM- FPM use a 25-Mhz clock rae and a maximum bandwidth of 200 Mbps. FPM RAM employs sophisticated method of locating data within RAM.
Extended Out Data Out RAM- EDO RAM is suppor s a clock rae of 40 MHz and a maximum bandwidth of 320 Mbps.
Synchronous DRAM- SD RAM comes in variety of speeds so that the memory canbe purchased to match the speed of the system bus in which it will be installed, curently SD RAM is available in PC66 PC 100 and PC133 versions. These versions offer the same data rates as their names and offer 528 Mbps 800 Mbps and 1.1 Gbps for PC100 and 2.1 Gbps for PC 133.
Ram Bus DRAM- RDRAM was brought to the PC memory market through a joint venture between RAM bus and Intel. RD RAM operates at up to 800 MHz and has a maximum bandwidth of 1.6 Gbps. RDRAM acchieves these very high lavels data through put by using a system called double clocking.
VRAM- Video RAM is specilized memory that is use for video card and not as part of the system's main memory VRAM is known as duel- ported memory because it is able o write both of its input/output (I/O) ports at the same times. This allow to simultaneously refresh the screen while text and images are drawn in memory.
WRAM- Window RAM is used to inhanced video performance. Also like VRAM WRAM can be written to and read from simultaneously and is much faster then its predecessor, VRAM.
SG RAM- Synchronous graphics RAM (SG RAM) is used on video cards to increase graphics performance.
When working with RAM there are two distinct types that you will encounter. Static RAM (SRAM)
and dynamic RAM . SRAM is costly then DRAM is used for cache memory in systems. DRAM which has become very affordable in recent years, is now cheap enough to make it possible to use it in large quantities in PC system.
SIMM(Single Inline Memory Module)- There are two type of SIMMs 30-pin and 72-pin. The 30-pin units, which were introduced first transfer data 8 bit at a time. The 72- pin SIMMs transfer data 32 bits at a time. The 72-Pin SIMMs apart from having 42 pin is 1.25 inches longer then the 30-pin SIMMs at 4.25 inches.
DIMM(Dynamic Inline Memory Module)- Most DIMMs have 168- pin are installed vartically and are secured by cache that engage the module at each end. DIMM use a 64 bits data bus. DDR SD RAM uses 184-pin DIMMs.
MEMORY TYPE-
Fast Page Mode RAM- FPM use a 25-Mhz clock rae and a maximum bandwidth of 200 Mbps. FPM RAM employs sophisticated method of locating data within RAM.
Extended Out Data Out RAM- EDO RAM is suppor s a clock rae of 40 MHz and a maximum bandwidth of 320 Mbps.
Synchronous DRAM- SD RAM comes in variety of speeds so that the memory canbe purchased to match the speed of the system bus in which it will be installed, curently SD RAM is available in PC66 PC 100 and PC133 versions. These versions offer the same data rates as their names and offer 528 Mbps 800 Mbps and 1.1 Gbps for PC100 and 2.1 Gbps for PC 133.
Ram Bus DRAM- RDRAM was brought to the PC memory market through a joint venture between RAM bus and Intel. RD RAM operates at up to 800 MHz and has a maximum bandwidth of 1.6 Gbps. RDRAM acchieves these very high lavels data through put by using a system called double clocking.
VRAM- Video RAM is specilized memory that is use for video card and not as part of the system's main memory VRAM is known as duel- ported memory because it is able o write both of its input/output (I/O) ports at the same times. This allow to simultaneously refresh the screen while text and images are drawn in memory.
WRAM- Window RAM is used to inhanced video performance. Also like VRAM WRAM can be written to and read from simultaneously and is much faster then its predecessor, VRAM.
SG RAM- Synchronous graphics RAM (SG RAM) is used on video cards to increase graphics performance.
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