This is an NVidia card I bought a couple of years ago. I wasn't having any trouble with this setup, though one monitor is slightly brighter than the other. I just now set them back to 60hz to see how they look--you have an excellent point about the speed of the card. I wasn't having any problems before, but I thought I wasn't using the monitors as efficiently as possible. They look okay now, so that may have been it.

I'm certainly getting a lot of mileage out of this thread! I hope it is interesting reading for whoever else stumbles across it when they're trying to solve one of these various problems we've discussed.

SRS