how old is this board .. if this is older .. then your gonna need to find the serial number on the board, or the fcc id number, there's a chance you see the serial number on POST screem, at the bottom when the memory is counted .. take this number and go to motherboards.org , they have a MoboFinder or whateer its called, should identify it .. good luck ..
-neural
-if all else fails there is always the technique, of taking numbers from anywhere on the board and plugging it in Google=) ..