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TYPES OF RAMS - PowerPoint PPT Presentation

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TYPES OF RAMS. . SDRAM .DDR SDRAM .RDRAM .FPMDRAM .EDORAM .ECCRAM .SGRAM .VRAM. Types of Dynamic RAM (DRAM ). SDRAM – Synchronous DRAM Synchronized to the system clock DDR SDRAM (Double Data Rate SDRAM) Transfer data twice for each clock cycle Rambus DRAM (RDRAM)

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Types of rams


Types of rams









Types of rams

Types of Dynamic RAM (DRAM)

  • SDRAM – Synchronous DRAM

    Synchronized to the system clock

  • DDR SDRAM (Double Data Rate SDRAM)

    Transfer data twice for each clock cycle

  • Rambus DRAM (RDRAM)

    Faster than SDRAM chips because they use pipelining techniques

Types of rams

Synchronous DRAM

  • Resides on DIMMs

  • Faster than previous EDO DRAM because it is synchronized with the system clock

  • Maximum transfer rate to L2 cache is approximately 528 megabytes per second,133MHz speed

  • Most common choice of Pentiums until recently

Types of rams

Double Data-rate SDRAM

  • Resides on DIMMs

  • Also known as SDRAM II

  • Faster than SDRAM because it transfers data twice for each clock cycle

  • Commonly used in PCs

  • 1.066GB/sec,133MHz

Types of rams


  • Resides on RIMMs

  • Faster than SDRAM

  • Uses a pipelining technique to increase speed

  • RDRAM memory chips work in parallel to achieve a data rate of 800+ MHz.

  • Use in PC 600,PC 700,PC 800

Types of rams

Fast Page Mode DRAM

  • First form of DRAM

  • Maximum transfer rate to L2 cache is approximately 176 megabytes per second.

  • Also called Page Mode Memory

  • Used in 8088,8086,80486

Types of rams


  • EDO = Extended Data Out

  • Resides on SIMMs

  • Sends and receives data simultaneously

  • Maximum transfer rate to L2 cache is approximately 264 megabytes per second.

  • In 80286,it uses +3.3 v

Types of rams


  • Direct Rambus DRAM by Rambus, Inc.

  • Often called PC800 RAM (doubling the Pentium 4 chip’s 400 MHz bus speed)

  • Like DDR SDRAM, it transfers data on the rising & falling edges of the clock cycle

  • Uses 2 data channels to improve transfer rates

Types of rams


Static RAM

  • L3 (Level 3) Cache is cache separate from the microprocessor chip and is on the motherboard.

  • L3 Cache exists only on computers that use the L2 Advanced Transfer Cache.

  • Error Correcting Code DRAM

  • Many higher end systems uses a special type of RAM called


Types of rams


  • Video RAM.

  • Memory ie optimized for video cards where each memory cell is dual ported.

  • Video data can be written to the RAM while the graphics adapter

  • simultaneously read from it to refresh the display.

Types of rams

SGRAMSynchronous Graphics RAM

  • SGRAM is a variant of SDRAM

  • SGRAM makes use of block-writes to increase video processing speeds.

  • SGRAM is single-ported so the CPU cannot write to it at the same time the image is being refreshed.

  • SGRAM is used in high-end graphics cards

Types of rams

Static RAM

  • Often used for Cache Memory

  • Very fast and reliable because these chips do not have to be recharged as often as DRAM chips hence the term “static”

  • SRAM chips: more expensive than DRAM

Types of rams

Static RAM

  • Cache Memory (Static RAM) helps speed up the microprocessor.

  • Cache Memory stores frequently used data and instructions.

  • Storing of each bit requires several transistors.

  • No refreshing is required.

Types of rams

Static RAM

  • Personal Computers have 2 and perhaps 3 types of cache memory:

  • L1 (Level 1) Cache (8KB to 128KB)

  • L2 (Level 2) Cache (64KB to 4MB)

  • L2 Advanced Transfer Cache on current microprocessors (built on the chip)

Types of rams

Static RAM

  • A computer with L2 cache usually performs at speeds 10 to 40 percent faster than those without cache.

  • Servers and workstations can have at least 2MB of L2 or L3 cache.

Types of rams



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