If you are interested in CPU upgrades for socket 7 motherboards and/or overclocking the k6-III, take a look at my two posts on the hardware forum under the AMD K6-3 ??? thread. The two posts are titled "amd k6-III" and "amd k6-III overclocking and performance issues". Also take a look at BlueScreen's post revealing a source for k6-III+ processors.
If you have FIRST-HAND experience overclocking MVP3-based motherboards and/or the k6-III CPU, PLEASE read my second post and see if you have any answers for the questions I raise there. If you have any answers for my questions, please e-mail me or post the answers in the hardware or overclocking forums.