New system and new vid card EVGA GTX 280 Has two DVIs and one mini HDMI I want to run three displays two will plug in to the DVIs and (can I use the mini HDMI for the Third display ) or do I need to save more for a second Vid card and SLI ?
You need two video cards to run three displays. SLI is not necessary (two matching cards hooked up in tandem), but you do need two Nvidia cards. If you wanted to game across three screens, then SLI would be necessary.
NVIDIA Surround on three displays using the GeForce GTX 280 is going to require that you save up and add a second GeForce GTX 280 for 2-way SLI.
This will require an SLI capable motherboard and a power supply unit capable of powering a 2-way SLI'd GeForce GTX 280 system. You'll need a power supply with a minimum +12 Volt continuous current rating of 60 Amps or greater and with at least two 6-pin and two 8-pin PCI-E Supplementary Power Connectors.
If you would of had a GeForce GTX 590 or a GeForce GTX 295 graphics card you would already have been able to run NVIDIA Surround on three displays.