Hi, thanks for helping me out here! "fields per second" refers to interlaced displays, right? So the vertical retrace frequence there is the 87 Hz number (since you get a vertical retrace after only 768/2 lines are displayed). Or am I confused? Although if I'm right so far, I'm puzzled as to how one could drive both interlaced and non-interlaced monitors off the same video signal - wouldn't the interlaced one need a video signal which has 'odd lines, then a vertical retrace, then even lines, then a vertical retrace'? Anyway, so which one is the one which is the number to look at when considering if the refresh rate is so high it might be dangerous to an old CRT monitor? I would assume it's the 'fields per second', since that's the frequency of the vertical retrace? E.g. my HP M50 manual says "Setting the screen resolution/refresh rate combination higher than 1024x768 at 60 Hz can damage the display." Even though the same document lists the vertical frequency range as "50-100 Hz"! Noel