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What is RAM Memory used for?

Introduction to RAM & it's Types

In today's video we are going to continue the topic of Random Access Memory from our previous video.

- DDR-SDRAM :
• 184 pin DIMM
• It consists of 8 cells but they are quite longer in length if we compare it to SDRAM.
• Ratio where the notch is present is 50:50.

- DDR2-SDRAM :
• 240 pin DIMM
• It consists of 8 cells of normal size, which consumes average amount of voltage.
• Ratio where the notch is present is 60:40.

- DDR3-SDRAM :
• Ratio where the notch is present is 30:70.

- RDRAM (Rambus Dynamic RAM) :
• Earlier it use to be 184 pin RIMM, but after that it was changed to 232 pin RIMM.
• This type of RAM is not available nowadays.

Position of RAM :
• Specific RAM slots are given in motherboard of particular size like only for DDR2 ie. DDR2 RAM can only get fitted in there, other types of RAM cannot be adjusted in it.
• They have locks at both of the end which makes it easy for the user to assemble and disassemble RAM in their slots.
• Many motherboard consists of 4 RAM slots but some are also coming with only 2 RAM slots.

Types of RAM :
• Computer Memory - 'Internal Memory' & 'External Memory'
• Internal Memory - 'ROM' & 'RAM'
• RAM - 'SRAM' & 'DRAM'
• DRAM - 'SDRAM' & 'RDRAM' & 'DDR SDRAM'
• DDR SDRAM - 'DDR' & 'DDR2' & 'DDR3' & 'DDR4'

- SRAM (Static RAM) :
• SRAM holds data in a static form, as long as the memory has power.
• Each bit is stored on four transistor that forms two cross coupled inverters.
• It is Cache Memory.

- DRAM (Dynamic RAM) :
• DRAM is called Dynamic because it must constantly be refreshed otherwise it'll lose the data in very short time.
• DRAM stores each bit of data in a separate capacitor within an Integrated circuit.

Capacity of RAM :
- 256 MB
- 512 MB
- 1024 MB (1GB)
- 2048 MB (2GB)
- 4096 MB (4GB)
- 8192 MB (8GB)
- Make sure you fit same amount of RAM in the motherboard ie. If one slot is of 4GB RAM then others should not be of 2GB or greater than 4GB RAM because it won't be able to consume appropriate amount of power, it should be remain balanced everytime.

Following listed are some of the Manufacturing Companies of Random Access memories (RAM) :
• IBM (International Business Manufacturing)
• Buffalo Technology
• Century
• CEON
• CHAINTECH
• ELIXIR
• HP
• ASUS

Advantages of RAM :
- If the RAM is of larger size than the programs will load faster and also multiple programs can run at one time.
- Power Efficient ie. uses much less power than disc drives.

Disadvantages of RAM :
- Volatile power outage will cause irrecoverable data loss.
- Space limited cost per bit is high.

- DDR RAM :
• Was Introduced in 2000.
• Range 4MB-2GB.
• Clock rate - 266 MHz
• Pins 184
• Used in P4
• Notch Ratio - 50:50

- DDR2 RAM :
• Introduced in 2003
• Range 32MB-2GB
• Clock Rate 533 MHz
• Pins 240
• Used in P4, PD, Dual to Core, Core to Duo and Quard
• Notch Ratio - 60:40

- DDR3 RAM :
• Introduced in 2007
• Range 512MB-4GB
• Clock Rate 800MHz
• Pins 240
• Used in i1, i2, i3, i5, and i7
• Notch Ratio - 70:30

- DDR4 RAM :
• Introduced in 2012
• Range 512MB-8GB
• Clock Rate 1600MHz
• Pins 240
• Used in i7 and i9
• Notch Ratio - 70:30


Questions & Answers to solve by yourself :
• What is RAM ?
• Types of RAM ?

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