As I conjectured a few weeks ago, Apple switching to a 32nm process in a tweaked version of the A5 processor in the ‘old’ iPad, (called iPad 2,4) has resulted in better battery life. Anandtech ran some tests and the difference is hefty, clocking in at close to 16% more life on the same battery.
This bodes well for a 32nm LTE iPhone this fall, as it should show up alongside a 28nm Qualcomm chip and a slightly improved battery, retaining current iPhone 4S usage times, even with LTE.
In addition, the 32nm die being smaller decreases the fail-rate of their manufacture, driving down costs slightly and increasing the margins on the most important iPad Apple sells.
This also allows Apple to test the 32nm part in a ‘stealthy’ way, rolling it out in a subset of older iPad...