![]() DDR2 SDRAM runs at a lower voltage (1.8 V) with more pins (240), which prevents backward compatibility. ![]() Standard (not overclocked) DDR memory modules top out at 200 MHz, whereas standard DDR2 memory modules top out at 533 MHz. While still double data rate (processing two read and two write instructions per clock cycle), DDR2 SDRAM is faster because it can run at higher clock speeds.
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