AMD Thunderbird & Duron Overclocking Revealed

If you remember the first ever Overclocking Guide that was published regarding the old Slot-A Athlons by Tom’s Hardware, you’ll remember that in order to change the clock multiplier of the older Athlons you have to manipulate two sets of pins: the four FID pins and the four BP_FID pins.  If the two settings didn't match, then the system wouldn't boot.

We originally assumed that the four jumpers we soldered onto our AZ-11 corresponded to the four FID settings Tom published in his first Thunderbird Overclocking Guide since adjusting them according to the settings Tom published worked perfectly.

An email from Tom Shaver, the creator of our favorite Slot-A ‘Golden Fingers’ overclocking device the K7OC, proved our hypothesis wrong.  Tom Shaver pointed out the possibility that the new Thunderbirds and Durons have the same FID and BP_FID pins that are on the older Slot-A Athlons and that the four jumpers we were setting were only setting one of the two and in order to actually increase the clock multiplier we’d have to find and adjust the second set of pins.  But what pins?