Gamingin3D has a little blurb on DDR400 and it being a transition phase...
It's a pretty good read,
worth your while!
All evidence seems to say so. With chipmakers receiving higher yields thanks
to the die shrinks down to .13-micron, among other factors, as well as the introduction
of Dual-DDR chipsets such as the "Granite Bay" or E7205 respectively
and its upcoming younger brothers, the 'Springdale' and 'Canterwood' with a
much more better price-performance ratio - it appears that DDR 400 is ready
to enter the mainstream crowd.