This guide is pretty good except for the section on setting up the memory. What you want to do is set the memory frequency to two times the FSB frequency (which you can't adjust) or one half the FSB clock (which you can adjust). Remember, the bus is "quad pumped". It transfers 4 chunks of data into and out of the CPU each cycle. So each FSB cycle generates 4 FSB clocks.
At a stock FSB clock of 1066 MHz (266 MHz FSB frequency), your memory clock should be at 533 MHz. Try running with memory Linked. As you increase your FSB, the memory freq will increase proportionately. If that doesn't work, run Unlinked and set your memory freq manually.
Download CPU-Z to check your FSB:RAM ratio. It should be a 1:1 ratio.