from
marco.org:
The A5X is too big and hot to run in the iPhone. Even a die shrink wouldn’t make it ideal.
"too big": A die shrink would halve the surface area - and the A5X is not double the surface area of the A5 (it has double the GPU area, but not double the CPU area - just some extra bandwidth). So overall, it would be smaller than the A5 that is in the iPhone 4S now.
"and hot": they can downclock it, as they have the last two times (from 1GHz to 800MHz). If it's still too hot, they can downclock the GPU independently, and still come out way ahead.
He says there's demand for increased CPU - but is there? (apart from competitors marketed as "quad-core") Does anyone think "great phone, if only it crunched numbers faster!" In contrast, graphics are noticed, all the time, and allow more sophisticated, mind-blowing games - especially with a HDMI display.
Of course, if they can use A15 cores, then that would be fantastic! (It just seems too soon.) And - why not? - combined with a Rogue G6200 GPU! No - it will be an A5X, the photo is a shop, to milk pageviews from our hopes...