PC3200 DDR RAM: Is it 200 Mhz or 400 Mhz?

As I mentioned before, I just bought an iMac G5 1.6 Ghz machine which based on Apple specifications, requires PC3200 (400 Mhz) RAM. While looking at different options, I realized that I had a machine at home that had DDR RAM.  After using a tool that reports the hardware specifications of the computer, I looked at the report and noticed that the computer has 2  Kingston DDR PC3200 RAM with a reporting speed of 200 Mhz. So now what, can I use a PC3200 (200 Mhz) if Apple’s specifications require PC3200 (400 Mhz) ?

After looking at different forums, I found this explanation that seems logical:

“ PC3200 DDR RAM runs at a FSB speed of 200 Mhz. Since it is a Double Data rate (DDR) RAM, it runs internally at double the speed of the FSB, thus at 400 Mhz internally.”

Based on this explanation, it should be clear that the speed should not be even mentioned in the specifications of the RAM or the computer, if we say that we need PC3200 DDR RAM, we are saying that PC3200 DDR RAM (200 Mhz) or PC3200 DDR RAM (400 Mhz) should both work.