A lot of people with P3V4X boards have found that the revision B03 of the Asus S370-133 work the best, surprisingly enough. I have one of those and an Abit slotket !!! and the S370-133 is able to hit higher FSBs with my P3-700 than the Abit one could, and at lower voltages and correspondingly temperatures.
Right now I'm running at 910 MHz (130 MHz FSB) at 1.70v Vcore with my P3V4X. And it's rock-solid, with everything from 3DMark 2000 (6872 on default benchmark) to Unreal Tournament (60+ fps average @ 1024x768x32BPP - Xan is my beyotch!) running. Even have 4-way interleaving enabled.
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