I have 2 cards in my system. I run 4 monitors.  2 for main 3d use and 2 for non-essential email, and non-3d stuff. I had 260's in the system. I just upgraded the main 3d one to a GTX 450 TI. Will the performance of the main card suffer or be limited by the slower card. Would my overall 3d  performance be better by replacing both cards. Eventhough I only run the 3d stuff on the monitors driven by the 450.
 
Thanks.
 
Wayne