By Jatin Goyal
Computer memory
3. What are Upgrade limitation of system?
1.What is Computer memory and Why Do
We Need It?
2. What are the Type of Compute...
Read-Only Memory Read-Write Memory
• non-volatile • volatile
 Volatile Memory losses contents when power is
removed
PROM
...
DAM SAM CAM
SRAM DRAM
SIMM DIMM DDR DDR2 DDR3
RAM
PRAM
DAM (Direct Access Memory)
- direct access to all memory cells
- RAM
SAM (Sequential Access Memory)
- data reading in se...
 The computer can access information held
anywhere in RAM by addressing that part of the
RAM directly.
 e.g if informati...
SRAM (Static Random Access Memory)
- volatile
-does not need to be periodically refreshed
- more complex internal structur...
SIMMs
 Single Inline Memory Module
 Pins on opposite sides form a single set of
contacts
1987
EDO DRAM
 EDO = Extended Data Out
 Resides on SIMMs
 Sends and receives data
simultaneously
 Maximum transfer rate to ...
DIMM(dual in-line memory module)
Small Outline DIMM(SO-DIMM)
DIMM mean module has Ics
or chips and connection
b/w both sid...
 Buffered memory put less strain on the electrical load
in Memory controller allowing a stable System that has
several me...
SDRAM
SDRAM PC66 transfer 533MB/s at 66Mhz
SDRAM PC100 Desktop Memory transfer 800MB/s at 100Mhz
SDRAM PC100 Server Memory...
Double data rate SDRAM
2002
DDR 2 2006
DDR 3
within the module and has the added advantage of a 30% reduction
in power consumption dropping the voltage from 1.8V...
DDR 4(future) 2015
Figure -Timeline of memory technologies based on Standard Organization
• Goal of new technology
o Increase overall through...
 Cl or CAS rating
 Over Clocking
 Nomenclature(Identification of module)
 Ranking
 Comparison of DDR module notch
SGRAM
Synchronous Graphics RAM
 SGRAM is a variant of SDRAM
 SGRAM makes use of block-writes to
increase video processin...
 Open the case and look at memory slots
 How many slots?
 How many filled?
 Review module imprint
 Examine module for...
Virtual Memory
 Virtual memory takes the place of RAM
memory
 You should have a 2:1 ratio of RAM to
Virtual Memory
Modifying Virtual Memory in
Windows 8
Major Manufacturers
• Corsair Memory
• Crucial
Technology
• EDGE Tech Corp
• GEIL
• G.Skill
• Hynix
• Infineon
Technologie...
Introduction of ram ddr3
Introduction of ram ddr3
Introduction of ram ddr3
Introduction of ram ddr3
Introduction of ram ddr3
Introduction of ram ddr3
Introduction of ram ddr3
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Introduction of ram ddr3

  1. 1. By Jatin Goyal Computer memory
  2. 2. 3. What are Upgrade limitation of system? 1.What is Computer memory and Why Do We Need It? 2. What are the Type of Computer memory and how they compared? 4. What they mean by multiple channel memory? 5. How to identify memory of pc? RAM Slot flash ROM and CMOS RAM
  3. 3. Read-Only Memory Read-Write Memory • non-volatile • volatile  Volatile Memory losses contents when power is removed PROM EPROM EEPROM EAROM Flash CAMDAM SAM
  4. 4. DAM SAM CAM SRAM DRAM SIMM DIMM DDR DDR2 DDR3 RAM PRAM
  5. 5. DAM (Direct Access Memory) - direct access to all memory cells - RAM SAM (Sequential Access Memory) - data reading in sequence - HDD, optical discs CAM (Content Addressable Memory) - associative memory - returns value according to supplied word
  6. 6.  The computer can access information held anywhere in RAM by addressing that part of the RAM directly.  e.g if information stored in the 1000th location in memory the system does not have to read the information in the preceding 999 locations to get there, instead it can access the 1000th location simply by specifying it.  RAM (Random Access Memory)  Holds data and instructions used by CPU  any piece of data can be returned in a constant time
  7. 7. SRAM (Static Random Access Memory) - volatile -does not need to be periodically refreshed - more complex internal structure, more expensive, less capacity than DRAM DRAM (Dynamic Random Access Memory) -volatile -to keep information must be periodically refreshed - structural simplicity, high capacity PRAM( phase change memory ) -non-volatiles
  8. 8. SIMMs  Single Inline Memory Module  Pins on opposite sides form a single set of contacts 1987
  9. 9. 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. 1990
  10. 10. DIMM(dual in-line memory module) Small Outline DIMM(SO-DIMM) DIMM mean module has Ics or chips and connection b/w both side in single line. DIMMs 1993
  11. 11.  Buffered memory put less strain on the electrical load in Memory controller allowing a stable System that has several memory module.  ECC code  ability to detect and correct the error during data transmission. ECC/ Registered DIMM Non-ECC/ Non-Registered DIMM
  12. 12. SDRAM SDRAM PC66 transfer 533MB/s at 66Mhz SDRAM PC100 Desktop Memory transfer 800MB/s at 100Mhz SDRAM PC100 Server Memory (ECC) transfer 800MB/s at 100Mhz SDRAM PC133 Desktop Memory transfer 1,066MB/s at 133 Mhz SDRAM PC133 Server Memory (ECC) transfer 1,066MB/s at 133 Mhz 1999
  13. 13. Double data rate SDRAM 2002
  14. 14. DDR 2 2006
  15. 15. DDR 3 within the module and has the added advantage of a 30% reduction in power consumption dropping the voltage from 1.8V to 1.5V 2010
  16. 16. DDR 4(future) 2015
  17. 17. Figure -Timeline of memory technologies based on Standard Organization • Goal of new technology o Increase overall throughput while retaining accuracy o RAM manufacturers continue to produce older RAM
  18. 18.  Cl or CAS rating  Over Clocking  Nomenclature(Identification of module)  Ranking  Comparison of DDR module notch
  19. 19. SGRAM Synchronous 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
  20. 20.  Open the case and look at memory slots  How many slots?  How many filled?  Review module imprint  Examine module for physical size and notch position  Read motherboard documentation  See if board supports dual channels or triple channels  Last resort  Take motherboard and old memory modules to a good computer parts store for conformation
  21. 21. Virtual Memory  Virtual memory takes the place of RAM memory  You should have a 2:1 ratio of RAM to Virtual Memory
  22. 22. Modifying Virtual Memory in Windows 8
  23. 23. Major Manufacturers • Corsair Memory • Crucial Technology • EDGE Tech Corp • GEIL • G.Skill • Hynix • Infineon Technologies • Kingston Technologies • Micron Technology • PNY • OCZ Technology • Rambus • Samsung • SimpleTech
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