Intel 64-bit Pentium 4s, 64-bit capable, is available now.

Lots of press noise about it. The one I like most: https://www.theregister.co.uk/2005/01/21/intel_64-bit_p4_in_retail/: "...chips, which feature Intel's AMD64-like EM64 technology...". It also has lots of references to mnore information etc.