OK I have a FIC AZ11e mboard + tbird 850 and 256mb pc-133 RAM. Its supposed to support pc133 but when I did the SiSoft Sandra diagnostic it said my memory bus was 100mhz. CPU bus is at 2x100mhz(200mhz) so can I not set the memory at 133mhz?
You answered your own question: "CPU bus is at 2x100mhz(200mhz)", that sounds like 100 MHz main bus. Now, if you adjusted the bus to 133, then it would go full speed.
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Again I may not be much help. I am having the same issue with mine. Look in your bios for a DRAM option that changes from 100 to 133. It may be as simple as that. I cannot figure it out on my mobo though. Good luck!