Sorry your wrong get your facts straight,I have both industry knowledge and about 500 different posts on various news and tech geek sites saying the same thing. Intel is using the AMD64 extensions like this site here.
http://www.geek.com/news/geeknews/2004Feb/bch20040218023905.htmNote it says they are "identical to AMD64"
Or this one
http://www.devx.com/amd/Article/20555?trk=DXRSS_LATESTSome diehard fans of AMD64 technology have expressed concern that Intel's exact cloning of the technology might be detrimental to AMD. However, Glaskowsky points out that Intel's entry into the world of 64-bit extensions is unalloyed good news for AMD. Prior to Intel's move, AMD's 64-bit extensions had only technical superiority, but didn't have market penetration. Because no other vendor was selling chips with those extensions, conservative purchasers had reason to hesitate.
However, now that Intel has joined the fray, Glaskowski predicts, prospective purchasers will begin examining the technology on a comparative basis. For AMD, such comparisons are good news. As benchmarks have shown, the AMD64 implementation performs very well. We don't know how much better the numbers are than Intel's, because the latter chips won't ship until June at the earliest. However, due to the high-bandwidth Hyper-Transport processor-to-memory bus of the Opteron architecture, AMD will likely retain a significant performance edge. (See Transport Your Application to Hyper Performance.)
In support of the position that these developments favor AMD, we can see that the uptake of AMD64-based processors in server systems has advanced considerably since the Intel announcement. Hewlett-Packard has announced new product lines based on AMD64 processors, while IBM and Sun have expanded their offerings.
It is clear that Intel's adoption of the 64-bit extensions is a major boost for the architecture, and will actually help drive adoption of AMD's Opteron and Athlon 64 processors. And it's clear that as both companies continue their decades-long battle, buyers will enjoy the benefits of ever richer feature sets and amazing performance without having to worry at all about compatibility.
http://news.com.com/2100-1006-5159067.htmlOr this one
http://zdnet.com.com/2100-1103_2-5160169.html?tag=zdfd.newsfeed