A start would be to identify who made your motherboard, brand and model, and bios id string.
Better yet the hardware onboard. To find make and model of pc hardware, EVEREST Home Edition is a free system diagnostics, system information program that will id most hardware onboard a mb.
Run the program and then:
Click on Computer
Click on Summary
Right hand window (hardware) if the text is blue
this is a link to the web site for that particular hardware.
An alternative program is Belarc Advisor from [url]www.belarc.com[/url] (a little more simple to use than Everest but not as good about identifying a place to find the driver).