It will work with a TB900, but it might not work at 133. Your TB900 is a B-which is made to run at 100, so even with the board capable of supporting 133, you may not be able to run your cpu at that speed. I do have a 1.2"b"(axia) that runs at 133 without a problem. You could always get the board and use it with your cpu for now, and upgrade to another cpu "c" later.