It's not new pdf,ffs man.. It's an old spec. of SSE5 since you said and I quote :"Hence there is NO former SSE5 instructions." There are and i gave you a link. XOP extensions,the one AMD links to are an added(made by AMD ) instructions, that are a sort of "leftover" from SSE5.These weren't duplicated in AVX and since AMD already got a positive review from developers they decided to use VEX decoding scheme on them and include them too(like a new 3dnow if you will). When Mr. Christie(a BD core design team member) stated they will support version 5 of AVX,it means they will support version 5-no mroe no less. You can find version 5 online and guess what-in order to be compatible ,the instruction format must be the same.