Random Access memory.
- 1. RAM (Random Access Memory) Md. Rafiul Islam PGD-0906
- 2. Index: • Introduction • History • Technologies • Position & Structure • Types of Ram • Memory cell • Difference • Capacity to store • Manufacturing companies • Other uses of RAM • Advantage & Disadvantage
- 3. Introduction: • Random access memory (RAM) is the best known form of computer memory. • RAM is considered as volatile memory, which means that the stored information is lost when there is no power. • RAM is made up of small memory chips that form a memory module. • Whenever you open a program, it gets loaded from the hard drive into the RAM. • This is because reading data from the RAM is much faster than reading data from the hard drive.
- 4. What is RAM(Random access memory)? RAM (Random Access Memory) is the hardware in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor. RAM is the main memory in a computer, and it is much faster to read from and write to than other kinds of storage, such as a hard disk drive (HDD), solid-state drive (SSD) or optical drive.
- 5. History: • RAM (Random Access Memory) was invented by Robert Heath Dennard at IBM Thomas J Watson Research Center in 1968.
- 6. Technologies Of Ram: Type Year Fpm (Fast page mode) 1990 EDO (Extended data o/p) 1994 SDRAM (Single dynamic RAM) 1996 RDRAM 1998 DDR SDRAM 2000 DDR2 SDRAM 2003 DDR3 SDRAM 2007 DDR4 SDRAM 2012
- 8. Structure of Ram: Notches for socket ”Handles” Socket Edge connector
- 9. Types Of Ram: • SRAM (Static Random Access Memory) • DRAM (Dynamic Random Access Memory) SRAM (Static Random Access Memory) oSRAM holds data in a static form, as long as the memory has power. oEach bit is stored on four transistor that forms two cross coupled inverters. DRAM (Dynamic Random Access Memory) oDRAM is called dynamic because it must constantly be refreshed and lose the data in very short time. oDRAM stores each bit of data in a separate capacitor within a integrated circuit.
- 10. Memory cell: SRAM Cell (6 Transistors) DRAM Cell (1 Transistor and one capacitor)
- 11. Difference: SRAM DRAM • Requires less memory. • Requires more memory. • Access time is low. • Access time is more. • Do not refresh. • Needs to be refreshed. • Faster access time. • Slower access time. • More power consumption. • Less power consumption. • Used in cache memory. • Used in main memory
- 12. Capacity Of Ram: From Beginning: • 256 MB • 512 MB • 1024 MB (1 GB) • 2048 MB (2 GB) • 4096 MB (4 GB) • 8192 MB (8 GB) • NOTE: Here every time the size of Ram increased by multiplying twice.
- 13. Manufacturing companies: • ASUS • Buffalo Technology • Century • CEON • CHAINTECH • ELIXIR • HP • IBM
- 14. Other uses of RAM: In addition to serving as temporary storage and working space for the operating system and applications, RAM is used in numerous other ways. • Virtual memory • RAM disk • Shadow RAM
- 15. Advantage & Disadvantage: Advantage: • Programs will load much faster. • Power Efficient, that uses much less power than disk drives. Disadvantage: • Volatile: a power outage will cause irrecoverable data loss. • Space-limited: cost per bit is high.
- 16. The end Thanks to all.