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DDR2 memory chips and modules use a naming convention similar to that used for the current DDR memory modules, but are not backward compatible due to incompatible module connections (number of pins), voltage and DRAM technology. DDR2 memory modules have a different key or notch than the same-sized DDR modules to prevent their insertion into an incompatible memory socket.
DDR2 memory chips will incorporate On-Die Termination (ODT) to minimize memory signal reflections at high speeds, thereby improving timing margins.
Key DDR2 features:
1.8 Volts operation, reducing power consumption by about 50 percent
Memory signal termination inside the memory chip ("On-Die Termination") to prevent reflected signal transmission errors.