I think, as others have mentioned, that the "133 issue" matters only to the following people:
those who are overclocking and have 200 Mhz FSB Duron or Thunderbird CPUs.
Personally, I am interested ONLY in stability and I do not overclock. Therefore, I am exceptionally happy with my MSI K7t Turbo-R since it has not ever crashed on me since I first turned it on a few months ago.
However, getting the RAID drivers working correctly was another story.