A nice feature of all VIA Pro motherboard is its ability to adjust RAM speed independent of Front Side Bus speed. You have the option to set the RAM speed 33Mhz higher or lower than the Front Side Bus speed. This allows you to get the most out of your expensive PC-133 RAM. If you were using the P3V4X on the 100Mhz FSB you can increase the RAM speed to 133Mhz. Likewise if you're on the 166Mhz FSB, you can decrease the RAM speed by 33Mhz if your PC-133 RAM can't handle that high a bus speed.