I have a good Radeon AGP card in my Dell 4550 for identical Envision LCD dual monitors. Resulting in one color look up table to serve both monitors. Meanwhile I will calibrate only the primary. To calibrate both monitors I must add another PCI video card. No games or speed requirements, no extra motherboard busses. What video-display board are you happy with for Photoshop type work? Geeks in the computer stores think only in terms of $500 gaming display boards hence have useless recommendations.