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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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Presentation Transcript
slide2

.SDRAM

.DDR SDRAM

.RDRAM

.FPMDRAM

.EDORAM

.ECCRAM

.SGRAM

.VRAM

slide3

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

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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
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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
slide6

RAM bus DRAM

  • 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
slide7

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
slide8

EDO DRAM

  • 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
slide9

DRDRAM

  • 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
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ECC DRAM

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
  • ECC DRAM
slide11

VRAM

  • 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.
slide12

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
slide13

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
slide14

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.
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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)
slide16

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.
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