With XP you have to use "span" mode, meaning you have one big desktop *across* 2 or more monitors. Using that mode in XP > Vista's crap of not having that mode. You had to have same size height monitors for it to look right if I remember correctly. Vista allowed mixed resolutions on two different monitors but when I used 2 video cards to try to use 3 monitors on Vista 64 Ultimate it would cause a condition like slow fps but wow always say 60 fps even though the images on the monitors were updated at what looked like 5fps. At the time I originally posted this others said they had similar problems but no one had a solution. One day I will get xp 64 and try it out but I've since given my two 8800 GTS's to my kids and have a single 285 on 2 monitors. Haven't tried w7 except in virtual box for taking a tour of w7 itself.