Which DDR memory runs at a lower voltage and at a higher speed than DDR2?

DDR3 memory operates at a lower voltage and provides higher speeds compared to DDR2. Specifically, DDR3 typically runs at a voltage of 1.5V, whereas DDR2 operates at 1.8V. In terms of speed, DDR3 offers data transfer rates starting from 800 MT/s (mega-transfers per second) up to 2133 MT/s or higher, while DDR2 generally peaks around 800 MT/s. This advancement in both voltage and speed makes DDR3 more efficient and capable of handling higher performance tasks than DDR2.

Furthermore, DDR4, though it also operates at a lower voltage (1.2V) and offers even higher speeds, is a later generation than DDR3 and cannot be directly compared to DDR2 in this context since the question specifically asks for a comparison to DDR2. DDR3 is the correct choice as it meets the criteria for operating at a lower voltage and a higher speed compared to DDR2.