DDR RAM is an abbreviation for double data rate random access memory. DDR2 is DDR Ram's second generation. SDRAM comes in two flavors: DDR and DDR2. The primary difference between DDR and DDR2 is that the bus in DDR2 is clocked at double the speed of memory cells, allowing four words of data to be sent each memory cell cycle. DDR2 can effectively work at twice the bus speed of DDR without speeding up the memory cells themselves.
What is DDR?
DDR stands for double data rate. It is used in computers and laptops and can transport twice data chunks to memory every clock cycle, thus the name double data rate. With the introduction of DDR RAM, there have been many upgrades known as DDR2, DDR3, and DDR4. All new variants of DDR RAM the DDR2, DDR3, and DDR4 memory modules will not be compatible or fit in any of the motherboard's DDR or DDR1 slots.
What is DDR2?
DDR2 stands for double data rate version 2. It is the DDR memory's second generation. This RAM variant was created to obtain a high data throughput for block transferring. It is the successor to DDR, with throughput for block transferring. It is the successor to DDR, with the key difference being an increase in the operational frequency between the RAM chip and the prefetch buffer, as well as an increase in the amount of both parameters. The prefetch buffer is a 4-bit memory catch in the DDR2 RAM chip.
DDR Vs DDR2 | Difference between DDR and DDR2
- DDR has 4 internal banks. DDR2 has four or eight internal banks.
- The transfer speed of the DDR varies between 0.20-0.40 gig transfer per second. While the transfer speed of DDR2 varies between 0.40-1.06 gig transfer per second.
- The DDR was released in the year 1998, whereas, DDR2 was released in the year of 2003.
- DDR has a slower speed than DDR2, but DDR2 has a faster speed than DDR.
- DDR is followed by DDR2, and DDR2 is followed by DDR3
- DDR's normal supply voltage is 2.5 V. But DDR2's normal supply voltage is 1.8 V.
- Performance wise DDR is not better than DDR2. Whereas it is better than DDR in terms of performance.
- DDR has a bus clock speed of 100 MHz- 200 MHz, while DDR2 has a bus clock speed of 200MHz-533 MHz.
- DDR has a channel bandwidth of 1.60-3.20 Gbps, and DDR has a channel bandwidth of 3.20-8.50 Gbps.