If its a Super Socket 7 M/B you can up to its onboard limitations, if its a regular Socket 7 M/B, you are limited to its standard setup that the BIOS allows, and the chipset capabilities of the M/B. You need to start your endeavors from the manual if you were lucky enough to have acquired the M/B manual, or look on the M/B itself and find the Manufacturers name and model # of the M/B and go to the manufacturers website, and search out the info you need, theres a lot of older M/Bs you can still get manuals for. You will need the manual to know how to set the onboard jumpers, which most all of the older M/Bs came with.
Details, Details, Its all in the Details, If you need help, Don't leave out the Details.