You can install your processor on this board. It has a FSB of 800 MHz means it s maximum supported FSB speed is 800 MHz. If you plug a CPU of lower FSB then it works on the CPU's FSB. Please mention the exact model number of your CPU and check the Gigabyte's side for the CPU support list. I have checked and there are plenty of processors of 533 MHz FSB. For finding out the exact CPU detail, use CPU-Z tool.