A6 S5L8950X should be be a new, quad-core chip and is supposed to be powering iPad 3.
Details about A5 S5L8950X are still unknown, but according to model number, it is expected to be be just dual-core.
So why Apple need both chips?
- The quad-core A6 is for the iPad 3, whilst the A5X is for rumored Apple TV update, the next-generation iPhone, or an additional iOS device
- Apple will sell a cheaper (read 8″) iPad with the A5X thinly slice plus the higher-end A6-powered iPad 3.
- The rumored 8″ iPad will use A5x processor