Re: Adding a 3rd Monitor, need some advice!
From my understanding, SLI and Crossfire setups run multiple graphics cards to split up the graphics to only ONE monitor. Placing that if you are running an SLI connection and have 2 monitors hooked up, technically the SLI infrastructure will not be active. Now if you do have multiple graphics cards within the computer, depending on which monitor you have hooked to what card, that display will take the resources from that one device. So when it comes to bottlenecking, it will only be as good as the current graphics card that is attached to that monitor.
I have not had a chance to run different model graphics with my SLI setup. I am currently running 2 "NVIDIA GeForce 7950 GT." But again, if you plan to run multiple monitors from an SLI source, the SLI will deactivate and will display a multiple screen setup. So technically if you plan to run the multiple monitors, you will not have to worry about SLI working or not with a different model. You can get any card NVIDIA or ATI for the 3rd monitor.
PSU:OCZ 600W modular - Mobo:ASUS P8Z68-V PRO - Processor:Intel Core i7-2600K - CPU Coolant:ZALMAN CNPS11X Extreme - Memory:CORSAIR Vengeance 8GB DDR3 1866 - Hard Drive:4.0 TB Seagate Barracuda XT 7200 RPM SATA 6.0Gb/s - Video Card:NVIDIA GeForce 7950 GT 512mb - DVD Drives:Sony 18x DVD+/- DL Burner and Samsung 18x DVD+/- DL Burner - OS: Windows 7 Ultimate 64-bit