Atom N475 with DDR3 Coming Q3 2010
 

There will be two CPUs, one Atom N475 clocked at 1.83GHz but supporting DDR3, and the N455 work at 1.6GHz, but unlike the N450 it will support DDR3 memory. This will be the only difference as Atom N455 stays at 5.5W TDP, while N475 stays at 6.5W. This indicates that there will be a new wave of Atom DDR3 based machines in the second half of the year but we don't think that DDR3 will make any important performance difference but as DDR3 is getting cheaper and will possibly make netbooks even cheaper in the long run.

http://www.fudzilla.com/content/view/17502/41/