Unity and the Predictive Engine communicate via a shared memory. The shared memory is a memory block in which both the Predictive Engine and Unity can share data, settings, and most importantly the Predictive Engine render. By default, the space allowed for the Predictive Engine texture can contain a 8K texture (7680x4320 pixels).

If the expert mode is enabled, you can change the size of this space in the Interface preferences.

If you try to load a texture larger than this resolution, a smaller texture with the same ratio will be created to fit in the shared memory.