Ok. First point, the 1.3 and 1.33 are the same price exactly. If you are seeing the 1.33 for 50 bucks more, shop around. I am in canada, and at www.pccanada.com they are EXACTLY the same price to the penny.
On the issue of speed, depends on what you are doing with it. It's fine for example to get a KT7A board, but that doesn't mean the board will support DDR Ram. Which means, your 1.33 will be almost the same thing as a 1.3. As far as memory being out of sink, I have no idea what the issue is. We have ALL been running 100/200FSB processors with PC133 ram for a while now, and nobody has saw fit to complain. I would say without DDR ram, going from 1.3 to 1.33 will get you MAYBE a 1% increase in overall preformance, if that.
Course, I am no engineer and I could be way off on this.....