Serving up big performance
Despite all of the trouble that comes with creating MCM designs, the payoffs are huge. Having multiple chiplets working together as a unified GPU means huge performance boosts and a much more efficient solution than bridged graphics cards.
Aside from massively improving performance with the power of two interlinked chiplets, AMD would also have the option to optimize each chiplet for performance or efficiency. This would help AMD either send performance to the moon at the cost of huge power draws, as rumors already suggest about 500W models, or moderately increase performance by setting more efficient clock frequencies on each chip.
might not be so bad if they scale it to need somehow
lighter loads lower clock frequencies or even turn one chiplet off
then crank it up only when needed