From a very reliable source, I have been notified that a 1/5 pci divisor exists and implemented on the AK35GTR. Personally, I have had problems running at 160ish FSB speeds. I have tried FSB speeds of 160 to 166 with the most relaxed memory timings and have booted into windows with no data or registry corruption which leads me to believe that a 1/5 pci divisor does exist. Another possibility that a 1/5 divisor exists is that when I select a FSB at 155 and above in bios, my video screen goes blank for a split second and that does not happen when i change from say 133 to 141. At 160ish FSB speeds my system becomes unstable after several minutes which leads me to conclude that user non-adjustable memory timings are too fast or the VIO is inadequate for FSB operations around 166 MHz. JAWS wanna give it a shot with a lower multiplier?