Intel again counts on its instructions and Penryn and all the other Intel 45 nanometre processors will have SSE4 instructions inside.

K10 will have SSE4A which is just a subset of instructions that will be able to run some SSE4 instructions but not all of them.

Penryn which is a pseudonym for whole 45 nanometre generation from Intel especially Yorkfield will come with full blown SSE4 and with Photoshop CS3 and some other software package to support it, it has a chance to win this multimedia war.