Modifying A 133 Fsb T-bred B Into 166 Fsb

[Nohto]

According to new information that I have just read you can close the L12 bridge on a 133FSB processor and get a 166 FSB.

Flickerdown
We mentioned earlier that there differences between Barton and TBred-B in terms of their L12 bridges. The difference can also be seen with the Athlon XP 2700+ and 2800+, which share a 166MHz FSB. Would it be possible to go straight to a 166MHz FSB by changing the L12 bridges? We decided to test this with a TBred-B Athlon XP 2200+:

To reconnect the two severed L12 bridges, we will use the same method used to unlock the multiplier. Apply correction fluid to the gap in the second bridge from the right (the bridge we will attempt to connect), then tape the adjacent bridges to prevent short-circuiting. Then connect the bridges using a conductive silver pen.

After connecting the bridges, boot up the computer to test. One major worry is that the PC may not boot if it has a high multiplier setting. If at all possible, unlock the Athlon XP’s multipliers as well to prevent booting problems.

In this case the PC booted and the BIOS quite clearly shows a 166MHz FSB. A simple L12 connection to unlock 166MHz FSB speeds seems to be well worth the effort – if you choose to unlock the multiplier, unlock this higher FSB setting as well to give a significant performance boost.