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MEMORY TYPE by Mind Map: MEMORY TYPE

1. SRAM

1.1. Very fast

1.2. Very expensive memory

1.3. Very big memory

1.4. No refreshing but volatile

2. DRAM

2.1. Constantly have to refresh

2.2. Data disappear without refreshing

2.3. Always have to provide those updates

3. SDRAM

3.1. Memory itself is synchronized with the clock rate of the memory

3.2. 133 MHz clock=PC 133

4. RDRAM

4.1. Introduced with the 400 MHz FSB Pentium 4

4.2. Licensed by Rambus , Inc

4.3. Expensive compared to SDRAM

5. (DDR) SDRAM

5.1. Twice the rate as "ordinary" SDRAM

5.2. 1600 MB/s @ PC 1600

6. (DDR2) SDRAM

6.1. Enhanced electrical interface , buffers , off chip drivers

6.2. 3200 MB/s @ PC 2-3200

7. (DDR3) SDRAM

7.1. Twice the data refer of DDR 2 layer chip capacities

7.2. The formula very similar

7.3. 6400 MB/s @ PC 3-6400