What are the differences in SDRAM, DDR1, DDR3 and DDR4 RAM
SD RAM
SD RAM
SDRAM-Synchronous Dynamic Random Access Memory. SDRAM synchronizes the memory speed with the
CPU clock speed. The SDRAM depends on the speed of the CPU bus. The data
transfer speed of the SDRAM is measured in nanoseconds and megahertz unit. It
runs with an average speed of 133 MHz
Bus Clock Speed 100-166 MHz
Transfer Rate
0.8 – 1.3 GB/s
Internal Rate
100- 166 MHz
Number of Pins
166 pins
Density
64 MB, 128 MB, 256 MB, 512 MB
Voltage 3.3 Volt
DDR 1
DDR stand for Double Data Rate it is the latest version of
SDRAM. DDR is synchronous with the system clock. The difference between SDRAM
and DDR is that SDRAM transfer data on the rising edge of the clock signal.
However, DDR transfer data on both edge of the clock signal that is on the
rising and falling edges of the clock signal.
Some of the variations of the DDR RAM available in market
are:
DDR 266, DDR 333, DDR 400
Bus Clock Speed
133 – 200 MHz
Transfer Rate 2.1 to 3.2
Internal Rate
133 to 200 MHz
Number of Pins
184 Pins
Density 512 MB, 1 GB
Voltage 2.5/2.6 Volt
DDR2
DDR3 is the second generation of Double Data Rate SDRAM
memory. DDR2 Standards names are, DDR2 400B, DDR2 400C, DDR2 533B, DDR2 533C
DDR2 667C, DDR2 667D, DDR2 800C, DDR2 800D, DDR2 800E, DDR2 1066E, DDR2 1066F.
The DDR2 Ram has 240 Pins.
Bus Clock Speed
266 to 400 MHz
Transfer Rate 4.2 to 6.4 GB/s
Internal Rate
133 to 200 MHz
Number of Pins
240 Pins
Density 512 MB, 1GB, 2GB
Voltage 1.8 Volt
DDR3
DDR3 is the third generation of Double Data Rate SDRAM
memory. Similar to DDR2, it is a continuing evolution of DDR memory technology
that delivers higher speeds. The DDR3
memory module physically look similar to the DDR2
Bus Clock Speed
533 to 800
Transfer Rate
8.5 to 14.9
Internal Rate 133 to 200 MHz
Number of Pins
240 Pins
Density 1GB, 2GB, 4GB, 8GB, 16GB
Voltage 1.35/1.5 Volt
DDR4
Bus Clock Speed 1066 - 1600
Transfer Rate 17 – 21.3 GB/s
Internal Rate 133 to 200 MHz
Number of Pins 288 Pins
Density 4 GB to 128 GB
Voltage 1.2 Volt
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