I have a multisync arcade monitor using the new PCI-E arcadevga2 video card and am experiencing wierd behavior after about 5 minutes of use.  I don't know if its the monitor or video card.  
Its very hard for me to explain.  The best way I could describe it is the colors start losing their vividness.  Almost like its cycling thru different hues of colors.  There is like a yellowish hue that is cast over the whole screen and flickers a little.
What the heck is going on?  Resolution set at 800x600 @ 56 hertz.