What is the difference between DDR2 and DDR memory module? Are they compatible with each other?
Compare DDR2 memory with DDR, the efficiency and data transfer rate of the former is even much higher. The frequency of DDR2 starts from 400MHz includes 533MHz, 667MHz and will reach 800MHz in the future while the DDR’s highest frequency reaches only 400MHz. As to the capacity, one DDR2 has at least 512MB. The highest capacity for one single chip of DDR2 could reach 4Gb. With the technique of FBGA chip packaging, it is possible that the capacity of a memory module could get much higher. Besides, the DDR2 uses 1.8V working voltage which is lower then 2.5V of DDR. The specification of DDR and DDR2 are much different from each other and they are certainly not compatible with each other.
