AN OVERVIEW OF PC MEMORY TYPES

Get Started. It's Free
or sign up with your email address
Rocket clouds
AN OVERVIEW OF PC MEMORY TYPES by Mind Map: AN OVERVIEW OF PC MEMORY TYPES

1. RANDOM ACCESS MEMORY(RAM)

1.1. not only kind of memory

1.2. not hard disk/SSD storage

1.3. hard disk- data is stored permanently on the drive SSD storage- is a memory that stored data in long period of time

1.4. data and programs can only be used when moved to RAM -spreadsheat -word processing

2. READ ONLY MEMORY(ROM)

2.1. read information from memory

2.2. unable changed / erased the information inside memory

2.3. a great place for BIOS in computer

2.4. types: PROM- programmable ROM                      - engineer write once           EPROM- erasable PROM                       - can write/erase/write again                       - can making changes           EEPROM- electrically erasable PROM                         - has flash memory and SSD in computer                         - has upgrade BIOS for programmes

3. STATIC RAM(SRAM)

3.1. very fast memory

3.2. very expensive memory

3.3. very big memory

3.4. used often in processor caches -L1,L2,L3

3.5. do not have to refresh every time but still volatile

4. DYNAMIC RANDOM ACCESS MEMORY(DRAM)

4.1. Dynamic -because RAM needs always                  refreshing/updating to maintain                  information                -data in memory will                  disappears without                   refreshing

4.2. Random access-can put information anywhere                           on memory chip                          -any storage location can be                            accessed directly

4.3. unlike magnetic tape

5. SYNCHRONOUS DRAM(SDRAM)

5.1. SINGLE DATA RATE(SDR) -168 pins

5.2. DOUBLE DATA RATE(DDR) -twice data rate as ordinary SDRAM -same clock speed -184 pins

5.2.1. DDR-200 200 millions transfer per second ( must multiply by 8 to get throughput MB/S) 200 X 8 = 1,600 = PC1600 DDR-200 = PC1600

5.2.2. DDR 2 ~faster speeds-twice as fast as DDR                     -240 pins ~faster process ~not backwards compatible -DDR2 cannot work in DDR slots

5.2.3. DDR3 -twice fast than DDR2 -larger chip capacities -240 pins -no backwards compatibility -speed brings sacrifice

5.2.4. DDR,DDR2,DDR3 won't fit because it has no backward compatible

5.2.5. DIMM not able to put the wrong memory types into different memory slide

5.3. not a static RAM

5.4. memory synchronous with common system clock

5.5. 133 MHz clock=PC133

6. RAMBUS DRAM(RDRAM)

6.1. 400 MHz FSB Pentium

6.2. much faster

6.3. licensed by Rambus,Inc.

6.4. relatively expensive than SDRAM