There are 2 differnt things you are looking at.   The bit depth of the CPU and the bit depth of the OS.   You can have a 64 bit CPU but a 32 bit OS.   Don't know why you would but you can.    Typically, if you have a 64 bit CPU, you'd use a 64 bit OS.

That said, what makes you think the PS4 is all 32 bit?   PS3's CELL was a combination of 32, 64 and 128 bit depending on what part of you CPU you are talking about.

Are you looking athte fact the CPU is x86 architecture and thinking that means 32 bit?  Because that article doesn't state the bit depth of either the CPU or OS.

Bit depth just refers to how many bits (pieces of tiny data) can be moved at once though a section of the CPU ro between the CPU and other componenets.   With the OS, it refers to how many bits of informaiton it can process at once.

Because a CPu has many different sub-sections inside it, the data paths can be wider or narrower depending on what it needs.  So some parts could need just 32 bits at a time, others would need 64 and other still 128 bits.  

All home CPU's sold over the past 6 or so years have been 64 bit.  With game consoles, it gets more complex but almost entirely irrelevant when comparing against another console.  For instance, the PS2 was a 128 bit while the Xbox was 32/64 bit.

PS4 is the most powerful. The mere fact that Microsoft didn't go into details is proof of that.

Apparently Sony and Microsoft agreed on same power, in order to receive great multiplatform 3rd parties support.
And I can't see where PS4 is better ? the xbox didn't reveal its GPU nor RAM speed, isn't it ?

i am guessing xbox one is more powerfull

No, the PS4 is capable of having 64 or even 128 bits in their components.   Where are you seeing it would only be 32 bits?  I'm only asking so I can clarify that part of my post that is confusing you.

I concurr with this, because if not M$ would have been more detailed and specific with the details. But instead they just mentioned the things in general, so that it would not look like that their hardware is less powerful spec-wise than the PS4.

Nope they did not, just to avoid comparison.   Is a tactic oftenly used by nintendo, but they are a bit xtreme with it and they dont talk about specs at all.

It was confirmed in Sonys Feb 20 briefing that they are also 64bit. See my comparison thread, they are using the same CPU and nearly the same GPU. Both are 64bit X86 based systems.

mmm...Not sure if serious.  In the best case for M$ that is, the PS4 and the XOne are on equal terms.