Solve : DDR1 vs. DDR2?

1.	Solve : DDR1 vs. DDR2?
Answer» I UNDERSTAND the DIFFERENCES for the most part. That is, DDR2 uses a 4-bit prefetch versus DDR1's 2. Data rate begins at 400-667 for DDR2 versus DDR1 ends at 400, and ETC, etc... my questions is: Is there a definitive VISIBLE difference in the two? Is there a hole or notch in the side or on the pins that makes it easy to differentiate? thanks!DDR is 184 pins. DDR2 is 240 pins. Each has a single notch, but it's LOCATED in a different place on each type. Wikipedia has a page for each type, including descriptions of the physical differences. http://en.wikipedia.org/wiki/DDR_SDRAM http://en.wikipedia.org/wiki/DDR2

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