Re: nVidia's 28nm Kepler expected to hit stores in late 2011?
40 divided by 28 is 1.42857....
1.42857... squared is 2.0408... so you can get a double the number of transistors in the same space moving from 40 to 28nm. That's just over 6.4 billion transistors unless my maths is completely off.
The reduction has to be squared to make it work for a square chip doesn't it?