Like OLD South, DDR2 may be declared Gone before its' Time is thru. 4.2 gb/sec speed is half as Fast as pre Transistor World could get AM Radio, Radar & any Programable(variable) signal to in frequency.

Yet this massive improvement also beggs, Why DDR3? It'd have to Get To Near 6 gb/s to beat 4.2 gb/s DDR2 or think Unbelievablely Blazing 1.05 Ghz/s Core.
Wowie, My Smoking are Pants. Opps, DDR3 talk probably.
Lastly, Think of How Multiplier Slowly grows Larger, as in Ultimate, DDR2 @ 4.2 Ghz/$ is 16.8 Ghz/s w/4X Multiplier, So I Eighted My Words, Maybe Digital can go above 2.0 Ghz/s.These number improvements are primarily due to intense work in Iraqi War going from radar at 40 ghz/s(or less) to near 400 Ghz/sec (or More) today.
DDR3 SUFFER.
drashek