- Double Data Rate x2, or double data rate DDR.
Like DDR, DDR2 is a type of SDRAM that allows data to be read on both the rising and falling of each clock cycle. DDR2 allows the bus to run twice as fast as DDR, and so can achieve double the throughput.
For more information see:
- www.xbitlabs.com/articles/memory/display/ddr2-ddr.html - DDR2 vs DR. Article provides information and comparisons on the performance of both DDR and DDR2, and the theory behind them.