The P3V4X is a nice board that comes in two flavors. The older revision comes with the ICS clock generator which gives you 32 FSB speeds. The newer version comes with the Winbond clock generator which gives you 16 FSB speeds. I think that they switched chips because the ICS chip runs very hot, and might not work at speeds of 140+ FSB. One trick used was to put a heatsink on the clock generator. Most people seem to have problems in the 140~150 FSB range. Very few can get it to 150+ FSB. The ICS chip goes to 166 FSB. The Winbond chip only goes to 150 FSB.
The P3V4X also allows you to o/c your SDRAM. At 66 MHz, it allows you to run either at the speed, or +PCI. At 100 MHz, it allows you 3 options: -PCI,0,+PCI. "0" meaning that the memory speed runs at the FSB speed. At 133 MHz, it allows you to run 0,-PCI.
To improve your memory scores, let the BIOS set your SDRAM by SPD. This allows you 4-way memory interleaving automagically. You can set it youself using H.Oda's utilities if you want to dabble and tinker.
I have a P3V4X and like it alot. There are better boards out there now, but at the time I bought it 13 months ago, it was the best IMO.