it means DOUBLE DATA RAM WITH 1GB
DDR. Technically, there is no "DDR1", only "DDR" and DDR2".
In DDR1 the Chip is in Rectangle shape and DDR2 the Chip Shape is in Square and DDR2 is Chip smaller than DDR1.DDR1 is centre cutting 7.5cm.DDR2 is centre cutting 7cm.DDR1 pin 92. DD2 pin 122.DDR1 pin is larger than DDR2.
ddr1
http://dhivacpt.blogspot.com/2007/10/difference-between-ddr1-and-ddr2.html
DDR2 RAM is slightly smaller and has square chips. DDR1 RAM has rectangular chips.
single
DDR1 RAM typically has 184 pins and a notch located closer to the center. DDR2 RAM has 240 pins and a notch positioned more towards one side. You can also look at the labeling on the RAM module itself to identify whether it is DDR1 or DDR2.
There is no difference, except that your computer will be using two ram slots, instead of just one.
The difference between DDR1 ram and DDR2 ram, is the advancement in technology. When you upgrade to DDR2, you are doubling the amount of flow information that can take place.
No
ddr1 and ddr2
open it up a look.