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TYPES OF RAMS

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

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  1. TYPES OF RAMS

  2. .SDRAM .DDR SDRAM .RDRAM .FPMDRAM .EDORAM .ECCRAM .SGRAM .VRAM

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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.

  12. 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

  13. 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

  14. 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.

  15. 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)

  16. 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.

  17. THANK YOU FOR WATCHING... THANK YOU FOR WATCHING...

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