Messer Chapter 1.3 - Memory

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  1. RAM
    Random Access Memory
  2. ROM
    Read Only Memory
  3. What can be done with ROM chips?
    Read only
  4. PROM
    Programmable Read Only Memory
  5. What can you do with PROM?
    Can be written to once , can be read
  6. EPROM
    Erasable Programmable Read Only Memory
  7. What can you do with EPROM?
    Write to it, erase and rewrite
  8. EEPROM
    Electrically Erasable Programmable Read Only Memory
  9. What can you do with EEPROM ?
    Read, write, flash
  10. SRAM
    Static RAM
  11. What are the three traits for SRAM?
    • 1. Maintains data without needing to refresh
    • 2. Very fast and responsive
    • 3. Used in processor caches
  12. DRAM
    Dynamic Random Access Memory
  13. Does DRAM need to be refresh?
    Yes or the data will disappear
  14. What is DRAM?
    Physical memory modules that go directly onto the motherboard
  15. SDRAM
    Synchronous DRAM
  16. What makes SDRAM different from DRAM?
    It is synced with the system clock
  17. SDR
    Single Data Rate
  18. DDR
    Double Data Rate
  19. In one clock cycle, how much data can you push with SDR?
    One data
  20. In one clock cycle, how much data can you push with DDR?
    2 data
  21. Break down DDR-200
    Double Data Rate (DDR Speed) with 200 million transfers per second
  22. How do you get the throughput (Transfer rate) of DDR-200 ?
    Multiply by 8 giving you the module name of PC1600 (1,600 MB/s)
  23. How can you figure out the I/O clock speed of a memory module ?
    Divide the DDR speed by 2
  24. How fast is the bus clock for DDR2 compared to DDR1?
    Double
  25. How fast is the bus clock for DDR3 compared to DDR1?
    4 time faster
  26. What is parity memory?
    Memory that stores an extra parity bit for error detection
  27. ECC
    Error correcting code
  28. What is ECC
    A memory module that can detect and correct errors
  29. What memory types is deal for servers?
    ECC and Buffer
  30. What is registered memory ?
    Memory that has a buffer(Register) between the memory and memory controller
  31. What is AKA for registered memory?
    Buffer memory
  32. What is multi channel memory?
    You can install memory modules on your motherboard in pairs or trios for maximum throughput
  33. How can you distinguish a single sided memory module?
    One side of the board will have chips on it
  34. How can you distinguish a double sided memory module?
    Chips are on both sides of the board
  35. Can the memory controller access all of the memory on a double sided memory module?
    No. Can only access one side at a time.

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andresg770
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Messer Chapter 1.3 - Memory
Updated:
2017-04-09 00:01:40
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Memory
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