I've used AN7-Ultra and AN8-Ultra boards. They had a dedicated monitoring chip (uGuru), and special BIOS settings for overclocking. Also they're made with utmost quality.

I overclocked a Thoroughbred Athlon XP 1433MHz to 2200MHz (200 x 11) without any stability problems. Moreover, since AMD didn't have any (200 x 11) processors out of the line, it was faster than the "king of the hill" 3200+ of that time.

That PC still lives on today, with no problems whatsoever.