I have not experimented with old hardware, but I will say that the old motherboard and processor have a higher power consumption. For example, a new motherboard and processor will consume 40-50 watts and yours 80-100 watts.
Try to install Linux OS for mining and check the result, if it does not work out, you can buy inexpensively asus m5a78l-m lx3 + x2 CPU + 4 GB DDR3