It depends on HOW you increase the FSB. If you increase the FSB but leave the PCI bus at or near 33 MHz, then you shouldn't have any problems. On the other hand, if you increase the PCI bus speed along with the FSB, then you may be in for trouble. I would check into how your specific motherboard handles the PCI divider at the various FSB speeds before changing the FSB frequency. I just installed a Abit KT7A-RAID, and the combinations of FSB and PCI bus speeeds that it offers is astounding! The onboard RAID works 100% at an FSB of 133 MHz and a PCI speed of 33 MHz (as would be expected!). Good Luck!