Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
What are high-end video cards for?
Games.
What makes one video card better than another one?
It runs games faster, or makes them prettier.
If a game runs better on your card, you hype it. Otherwise no one will have any reason to buy it.
Personally, I think nVidia has lesser quality FSAA. My 9800Pro had better AA than my 6800GT. At least I could use 6xAA. 8x won't even run at a decent framerate in HALF-LIFE for me.
Maybe I'm getting off topic :)
I'm assuming you have tried the nview properties?
Edit: PS yes I use my GT for a dual setup, and I can set a seperate resolution/refresh for each monitor.