Okay heres my problem. I just purchased 2 512mb sticks of what was labled pc2700 from pny. I installed the first stick into my x31 which supports 2700 per IBM's website. Fired up cpuz heres a screenshot. Looks like pny is labeling 3200 as pc2700 my laptop can use it so i don't really care. But as you can see the ram is running at 133mhz at a 3:4 ratio, ddr266 speeds still. So i try the other stick in my other centrino laptop a Gateway 200x same thing still running at ddr266 speeds. I looked up both chipsets on Intels site and both of them support ddr333. So I doubt its the laptops. It may be the ram but before I return them I want to check in with any other Centrino owners that are using ddr333 thanks.