Sorry, they are extending AMD 64, not Intel 64. I find it laughable that Intel has branded x64 as its own when they spurned the idea when introduced by AMD.

It really doesn't matter who was first; M$ said they would only support 1 64bit set, AMD wrote theirs first and thus got the prize. However, AMD has had an open license on all the SSE sets to keep the anti-trust goons away. This is essentially Intel building new instructions in on top of AMD64 (also known as Intel64, formerly EM64T).

In this instance, AMD essentially won the battle, but is losing the war.

no mention of new mobos or their features.

Acording to aggreement (around 1999) of Intel With AMD with most of terms atill secret. AMD has automatic rights to embed all future releases of SSE in their processors. yes without new approvals/agreements/licences.

Folowwing vaguely describes that but i had seen an article describing it specifically for SSE

http://en.wikipedia.org/wiki/Advanced_Micro_Devices#8086.2C_ 0286.2C_80386.2C_Am486

On December 30, 1994 the Supreme Court of California finally formally denied AMD rights to use the i386's microcode. Afterwards AMD and Intel concluded an agreement, the details of which remain largely secret, which gave AMD the right to produce and sell microprocessors containing the microcodes of Intel 286, 386, and 486. The agreement appears to allow for full cross-licensing of patents and some copyrights, allowing each partner to use the other's technological innovations without charge. Whatever the details, no significant legal action had resulted between AMD and Intel (until the 2005 antitrust suits in Japan and the U.S.), and the agreement evidently has not provided a "clean break".