RAMRAM

What Is Ram ?What Is Ram ? RAM is an abbreviation for Random Access Memory. It is the

"working memory" in a computer.

It usually refers to "temporary" memory, so when the system is

shut down, the memory will is lost.

Additional RAM allows a computer to work with more information

at the same time which can have a dramatic effect on total system

performance.

RAM is also known as main memory, internal memory, primary

storage, memory "stick“ and RAM "stick" .

Each motherboard supports only a certain RAM of memory types

in certain combinations.

RAM come with various storage capabilities. RAM memory

modules can be purchased in 256MB, 512MB, 1GB, 2GB, and 4GB

sizes.

Types of RAM :Types of RAM :

i. SIMMii. FPM RAMiii. EDO RAM iv. SDRAMv. DDR RAMvi. DDR2 RAMvii. DDR3 RAMviii.RD-RAMix. SODIMM

SIMMSIMM

• SIMM, which stands for single in-line memory module. This memory board

used a 30-pin connector and was about 3.5 x .75 inches in size (about 9 x 2

cm).

• In most computers, we had to install SIMMs in pairs of equal capacity and

speed. This is because the width of the bus is more than a single SIMM. For

example, we would install two 8-megabyte (MB) SIMMs to get 16 megabytes

total RAM.

• Each SIMM could send 8 bits of data at one time, while the system bus could

handle 16 bits at a time. Later SIMM boards, slightly larger at 4.25 x 1 inch

(about 11 x 2.5 cm), used a 72-pin connector for increased bandwidth and

allowed for up to 256 MB of RAM.

FPM RAMFPM RAM• FPM DRAM “Fast page mode dynamic random access memory”

was the original form of DRAM. It waits through the entire process of locating a bit of data by column and row and then reading the bit before it starts on the next bit. Maximum transfer rate to L2 cache is approximately 176 MBps.

• EDO DRAM: Extended data-out dynamic random access memory does not wait for all of the processing of the first bit before continuing to the next one. As soon as the address of the first bit is located, EDO DRAM begins looking for the next bit. It is about five percent faster than FPM. Maximum transfer rate to L2 cache is approximately 264 MBps.

EDO RAMEDO RAM

SDRAMSDRAM

• SDRAM , which is short for Synchronous dynamic random access memory is a type of DRAM that runs in synchronization with the memory bus.

• Beginning in 1996 most Intel based chipsets began to support SDRAM which made it a popular choice for new systems in 2001. SDRAM is capable of running at 133MHz which is about three times faster than FPM RAM and twice as fast as EDO RAM.

• Most Pentium or Celeron systems purchased in 1999 have SDRAM.• The idea is that most of the time the data needed by the CPU will be in

sequence. It is the most common form in desktops today. Maximum transfer rate to L2 cache is approximately 528 MBps.

DDR RAM

DDR RAM, which stands for “Double Data Rate” which is a type of SDRAM and appeared first on the market around 2001.

The difference between SDRAM and DDR RAM is that instead of doubling the clock rate it transfers data twice per clock cycle which effectively doubles the data rate. DDRRAM has become mainstream in the graphics card market and has become the memory standard.

DDR2 RAM

DDR2 RAM, which stands for Double Data Rate 2 is a 2nd newer version of DDR which is twice as fast as the original DDR RAM.

DDR2RAM came out in mid 2003 and the first chipsets that supported DDR2 came out in mid 2004.

DDR2 still is double data rate just like the original DDR however DDR2-RAM has modified signaling which enables higher speeds to be achieved with more immunity to signal noise and cross-talk between signals.

DDR3 RAM

DDR3 RAM runs at higher clock speeds as mentioned. This means that all components within the Graphics Card can benefit from recieving information at a faster rate.

Pixel Shader Units and vertex Shader units can recieve the information faster (the components that process information) and therefore work more efficiently, giving a boost to frame rates while gaming.

So it give more support in gaming PC. The data speed of DDR3 RAM is faster than DDR2 RAM.

RD-RAMRD-RAM• Short for Rambus DRAM, a type of memory (DRAM) developed by Rambus.

Whereas the fastest current memory technologies used by PCs (SDRAM) can deliver data at a maximum speed of about 100 MHz, RDRAM transfers data at up to 800 MHz.

• In 1997, Intel announced that it would license the Rambus technology for use on its future motherboards.

• The fastest type of computer memory available. Typical SDRAM can transfer data at speeds up to 133 MHz, while standard RDRAM can crank it up over 1 GHz.

• Though some motherboards can use RDRAM as system memory, it is so fast, most boards cannot fully benefit from the speed. Because of this, RDRAM is typically used for video memory on graphics accelerator cards, for cache memory (located on the CPU), and for system memory in high-performance workstations and servers.

SODIMMSODIMM• Many brands of notebook computers use proprietary

memory modules, but several manufacturers use RAM based on the small outline dual in-line memory module (SODIMM) configuration.

• SODIMM cards are small, about 2 x 1 inch (5 x 2.5 cm), and have 144 or 200 pins.Capacity ranges from 16 MB to 1 GB per module.

• To conserve space, the Apple iMac desktop computer uses SODIMMs instead of the traditional DIMMs. Sub-notebook computers use even smaller DIMMs, known as MicroDIMMs, which have either 144 pins or 172 pins.

REFERENCEREFERENCE

• http://pcsupport.about.com/od/componentprofiles/p/p_ram.htm

• http://computer.howstuffworks.com/ram4.htm

• http://www.technibble.com/types-of-ram-how-to-identify-and-their-specifications/

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Present By:

•Owen•Seelan•Seng