Any structure which enables from treating digitized information,
for example, computer composed of "inert matter" or brain composed of "biologic matter",
distinguishes itself, in a first analysis, by two major characteristics :
- its capacity to do, in a minimum time, of successions of binary changes : of "0 to 1" or of "1 to 0 " (of non-activated state to activated state or of activated state to non-activated state).
For convenience, we chose the gobes as measure unit (10 power 9 operations, binary, elementary, per second).
- its memory counted by means of elementary units of information : the bits which are representative of the numbers "0" or "1" (non-activated or activated).

Let's take for example activity of photosensitive cells which constitute bottom of the eye (the rods and cones of the retina situated around visual axis).

Considering the processes which enable the digitalization, memorization and animated images,
and, knowing the difficulties for memorizing in a coherent way, characteristics of light's waves, for differentiating them, …, for mixing them and to compose in the abstraction's domain and according to innate processes, the virtual images which enable our world's understanding (processes much more complex than those used with the digital cameras),
it is reasonable to admit that analysis of a "image point" recognized by means of the eyes require at least 10 successive treatments per second,
every treatment necessitating 100 elementary binary operations,
and thus, for a photosensitive biologic cell, 1000 elementary binary operations per second.

On the other hand, seeing that every cell is a "pôle of interpretation" connected to brain,
and that our body is composed by more than 10.000 billion cells having a similar binary treatment activity to the one of the cones and rods of the retina,
the brain should enable from effecting more than 10 million of gobes.
This estimation seems to us however very below reality.

Indeed, into the cells take place of ceaseless creation activities which require, too, binary operations. Think to the immunization process ; in the cells are notably imagined, synthetized, experimented and utilized, according to lived experiences and universal references of value, molecules which must combat pathogenic agents,
molecules the structure of which will remain ignored, probably for ever, of the conscious understanding.
Without forgetting naturally, the concepts, ideas, anticipations, dreams, ..., that "furnish" our abstraction domain and which presuppose too data processings, ceaseless, with the corresponding binary operations.

If we want to evaluate number of "binary changes" which are treated by means of brain, it's therefore necessary to take into consideration working of this one.
That is why, knowing works of John C Ecclès, Nobel prize :

"The key activity of a synapse is that one of the synaptic vesicles liberates the transmitting substance which it contains : it’s an exocytosis ... A nervous impulse sends a large number of ions Ca ²⁺ in a button, thousands of times more than for the four ions Ca ²⁺ required for the exocytosis.
… the action of the mental intention is only the probability's modification of the vesicular emission of the synapses activated." (Cf. How the Self Controls Its Brain),

we retained estimations of Stuart Hammeroff :

"If we make hypothesis that microtubes are arranged in a parallel way and spaced of 100 nanometres, and that we take into consideration in cerebral volume what corresponds to neuronal cytoplasm, we obtain approximately 10 ¹⁴ microtubes in  human brain. If each of them can change of state all 10 ^-9 or all 10 ^-11 second, all cerebral microtubes thus have a processing capacity of information of about 10 ²³ to 10 ²⁵ bits per second. ".

The human brain could effect (can effect) so, at least, "10 power 14 " to "10 power 16 " gobes.
As for its capacities of memorisation, they are of much superior to that of the computers configurations,
and it especially since brain cannot be separated from all body's cells ; think for example, to myriads of processes organizations with biological effects, of processes organizations with behavioral effects, even with deadly effects, memorized on DNA and RNA.
As a consequence, it is utopian to want to know exactly, the "equivalent memory" of the inseparable set : "brain - body".
We consider nevertheless that it is amply superior to "10 power 25 " bits.

But then, what can we say about biggest computers, at this year 2009 ?

Except the military equipments, Blue Gene d' IBM would be one of the most powerful of the planet, with about 280 thousands of billions elementary binary operations per second (280 téraflops), and the National Centre For Scientific Research would have a set : "BlueGene/P – Power 6" of 207 téraflops (207 thousands gobes).
Nevertheless, the computers's capacity increase always ; IBM revealed its new great computer : Blue Gene/P capable of treating 3 million billions elementary binary operations per second, 3 petaflops, 3 millions gobes (compare with the first great computer conceived by Seymour Cray, in 1976, which was effecting only 160 millions elementary binary operations per second).

Our brain ("10 power 14" to "10 power 16" gobes), would be thus equivalent to more than 100 millions big computers which would enable, individually, of treating 1 petaflops (10 power 6 gobes) !
The supremacy of the human brain is obviously indisputable and it, although man cannot compete with the computers, in numerous domains.

Other main remarks :

- computer, of the inert matter, cannot judge and to take into consideration the sense of the words, letters, sentences, …, concepts, ideas, speechs, without softwares which express the man's faculties and man's intentions.
It’s a tool without consciousness of the things and which never set a problem ; a spirit, that of the man, has to make it for him.
In other words, reactivity and power of the computers depends on technologies that we have of the inert matter, their "intentions" are those of the men who make the softwares.

- when we remember ourselves a word, this one "emerges" almost always associated with several concepts, ideas, …, and past situations.
Memorized in precise and specific cerebral zones, and interconnected, the virtual objects thus express the formatting of the brain made in particular during the education and according to the lived experiences.
Consequently, how not to think to fragmentation that affects the hard disks after a long use and which slows down the computers's functioning ?,
how not to imagine the "defragmentation" of the brain ?,
defragmentations which could be, in certain cases, a therapy.
Of brains "better formated rather than too full",
Michel de Montaigne (1533 – 1592) would not contradict us !

- creative entity of transcendent order, master of the "sense", who executes and uses the elementary changes : "0 to 1" or of "1 to 0 " (non-activated state to activated state or of activated state to non-activated state) into brain, is too, directly implicated in body, by means of the micro softwares which are in the cells.

Each of you, thus can judge the intelligence level of the computers and the "contents" that we must give to concept of artificial intelligence, today.

So much essential facts that the proselytes of the artificial intelligence, do not said ! 
End of digression.

*