From ExtremeTech:

Intel shifted the majority of its Pentium 4 processors to 64-bit capability over the weekend…

 

For those who are not up to play on 64 bit in the Wintel space, the general message is:

• x86 32bit – is to become legacy


• x86 64bit – is to become the new mainstream


• Itanium II – Is to retain it’s position of high end