These drivers work for my PC-100 motherboard from www.pcchips.com. I have the M590V12 motherboard. It is for the CMI8330/C3D built in sound on motherboard. When you start up computer the bios will say CMI8330/C3D audio adapter. You must look really quick to see this cause it goes by fast. This is the one for that. I have found that other CMI8330 drivers would not work right on my system but this one did.