It has nothing to do with L1 bridges (they are unlocked in my case) but with the MSI current BIOS version - read this:
One interesting note is that when we first received the motherboard, it was using BIOS revision 10D. Later on MSI sent us a BIOS update, revision 10E, to correct some performance issues with the original.. In both revisions, the multiplier ratio settings we were able to select in the BIOS were only default, or from 8.5 to 12.5. Therefore, with the old BIOS, you might not be able to lower the multiplier in order to take advantage of higher FSB speeds. For example, if you have a 1GHz (100MHz FSB) CPU and you want to run it at 133MHz FSB, you would be out of luck since the multiplier ratio is 10, and even if you unlocked the CPU, you will not be able to get the multiplier ratio down to 7.5 on the K7T Turbo.
That constraint could really be a problem for overclockers everywhere. For example, when we tried to run our FSB testing, we ran into problems where we couldn’t increase the FSB speed a lot since the lowest multiplier ratio we were able to achieve was 8.5.
Fortunately, after some discussion with MSI, they released another revision of the BIOS, 10F, which has multiplier ratios from 5 to 12.5 available. We immediately flashed the new BIOS and ran all the tests again.
(From
www.anandtech.com) - hope they will release this BIOS soon...