SHENGTON.........
You missing the most important part .....
PC3200 [highlight]is another way of writing [/highlight]PC400 or DDR 400.
All three of those mean that the bus speed of the RAM module is 400MHz. In similar fashion PC2700 is PC333 or DDR 333 (333 MHz)
PC2700 is another way of writing PC333 or DDR333.
All three of those mean that the bus speed of the RAM module is 333MHz
And the same thing applies to PC2100 ....it's 266 MHz.
Hope this clarifies thing for you.
dl65