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I think all you need to do is, when you have a question about something, come here and ask and one of us will know the answer.
GDDR is memory is memory that you'll only find on video cards. DDR is computer memory, and you're right: it stands for Double Data Rate. So, DDR3-1600 memory has an actual clock speed of 800 MHz with a multiplier of 2 (double data rate) which makes it 1600. It's very similar to the bus speed of a CPU: the bus speed is QDR, or Quad Data Rate. So if you have a CPU that has a Front Side Bus speed of 1333 MHz, then its bus speed is 333 MHz. The CPU's multiplier multiplies the 333 to make its actual clock speed. For example, a CPU with a FSB of 1333 and a multiplier of 10 would result in 3.33 GHz because 10 x 333 is 3,330 (3,330 MHz).
To apply that to modern CPUs like Intel's latest CPUs, there is no Front Side Bus. They use a BCLK (Base Clock) which is also the PCI-E frequency, and it is at 100.00 MHz and it is not QDR or anything. Instead, now the CPU's multiplier does everything. So for 3.3 GHz, a multiplier of 33 is used. Intel simplified it! :) For that, I am grateful because it made it very easy to overclock my i5-2500K to 4.7 GHz by just increasing the multiplier to 47 and increasing the core voltage in order to provide it the power that it needs. Fortunately, it really was just as simple as that for my CPU and motherboard (well, I had to do all of the recommended testing in order to make sure my system is stable, but still).
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