SiS645DX chipset is one of the highlight by SiS at CeBIT where this chipset will provide 533Mhz support for Pentium 4 and of course DDR333 support as well. VR-Zone has a chance to take a look at the SIS645DX reference board from SiS and we have evaluated its performance under DDR266, DDR333 and even DDR400 modes. More interestingly, we have tested out the 533Mhz FSB support on this chipset by using a 533Mhz P4 2.4Ghz (18x133) processor.