The Abit VT6X4 is Abit's second attempt at a VIA chipset based motherboard. The first one Abit made, the VA6, was based on the older Apollo 133 chipset. The VT6X4 is based on the newer ApolloPro 133A chipset. The 133A chipset has quite a few advantages over the 133 chipset, chief among them being the ability to control RAM speed independent of system bus speed.