I finally got around to trying EC2 this weekend, and it's pretty slick. I just wanted a *nix box to try out SBCL threading. I love the convenience. Anyone know

I finally got around to trying EC2 this weekend, and it's pretty slick. I just wanted a *nix box to try out SBCL threading. I love the convenience. Anyone know off-hand what extended instruction set these machine instances offer? I.e. MMX? SSE? SSE2?