Some questions which we need to answer then :

1 ) What is the effective level of visual precision computed by those processors for Avatar, versus the level of detail that's processed in the human visual cortex?

2) Is the synapse the equivalent of a transistor if we are to estimate the respective computing power of a brain and a computer chip? (i.e., is there more hidden computation going, on other levels? As synapse use different neurotransmitters, does that add additional computational capability? Are there processes in the neurons that similarly do computational work too? Are other cells, such as glial cells, performing computationally relevant operations too?)