most graphic cards won't output the correct signal for an arcade monitor without extra help. For instance I use a Trident t-64 card which has a program written for it to output to 15khz, other cards have similiar setups but really aren't ideal--to connect your pc directly to an arcade monitor without something to alter the signal generated by the video card is not a good idea--thats why i mentioned the arcadevga above--it does all the conversion on the card for multiple resolutions.