Oh, so when you take photos and record videos, the data doesn't touch the CPU?
It touches the CPU but it doesn't need to be cached. The CPU loads it, computes on it, then sends it on its way. Hence a 8mb cache wouldn't work any better than a 4mb cache or even a 1mb cache. It's the changes to the storage bandwidth that reflect the better camera.
The uncompressed data generally doesn't
And the Image Signal Processor doesn't share the L3 cache?