Which bridge tweak(s) do I do on a Tbred B to get past the x12.5 multiplier?

[Ionizer86]

I heard (and have experienced) the x12.5 multiplier limit on my 1700+ Tbred B. I'd like to set higher multipliers since my PC2100 ram is maxing out at about 170FSB. Anyone know which bridge tweak(s) I have to do? My Physics teacher has offered me his conductive pen for a little bit.

 

[fusionpit]

This is the first of any limit I have heard. My 1700 B has Multis 4-22 or so.

 

[myocardia]

Here you go. That page even lets you figure out how fast it will run, once it's modded.

 

[Ionizer86]

The loop thingy trick is pretty cool. I think there was another way to unlock 12.5 and above by tweaking some bridges on the top side of the chip (was it L3?) If there's a way to do so by making new traces there, I'd be willing to try.

 

[Ionizer86]

Fusionpit, which multiplier have you set? Try setting x13 and seeing if it will boot up properly. Mine messes up and the PC boots up at 11x100 whenever I set x13 or higher.

 

[KF]

A lot of (most?) mobos which otherwise will override the factory multiplier, do not have the circuitry to control the 5th multiplier bit. Your 1700+ has it set low. The 11 multiplier has all the L3s closed (low). The fifth L3 bridge is joined under the plastic by a thin, nearly invisible copper wire. (Chips that use a higher multiplier (over 12.5) have that bridge open.) Unfortunately just cutting that one bridge may set the multiplier too high, or to an illegal, no-boot multiplier. That may make it impossible to boot, since resetting the CMOS normally sets the multiplier to the default. Setting the buss to 100 instead of 133 may get you by that. Otherwise you should set the multiplier to something bootable. I set mine to 15.

Cut the L3 bridge furthest from the L3 label. I did it by scratching the surface lightly with the tip of a very sharp knife, and using a magnifying glass. I checked it with an ohmmeter using some straight pins for probes.

The complete explanation. More than you ever wanted to know.

Interactive T-bred painting guide link I can't link directly to the diagram.

 

[Ionizer86]

! Thanks KF, that's literally a massive amount of resources I guess I'll look at it if I have time, but for now, I think I'll stick with x12.5 especially since if I get better ram in the future, a lower multiplier will be ideal.