To explain JO3's post a little further: The reason DDR2 is not worth yet is because CPUs runs at FSB speeds lower than that of RAM. Take for example a 2.4GHz CPU (quad-core) that runs at 1333MHz. It is running at a FSB of 333MHz quad-pumped:
4 x 333MHz = 1333MHz
What do you mean?
Correct.
edit: Correct me if I'm mistaken, but only Intel processor bottleneck your RAM correct? I'm no expert with AMD, but from what I see their FSB is called Hyper Transport and that runs at 2000MHz (number taken from my processor)
Learned from watching you and wol-va-rine talk about it hahahah