I enjoy an RADEON 9800 display adapter with multi-monitor support (so currently running two monitors sour this one) and I have a NVIDIA GEFORCE installed on duplicate box for what I hope would be my third monitor. However the third one through NVIDIA doesn't work. I have verified NVIDIA works if it is the simply card in the box, but near both cards I can't use the NVIDIA one (even though Device Mgr says it is operating fine, it doesn't show up surrounded by the "extend my desktop" dialog under display.)
Answer:
Sorry you can not, unless you build a PC near two Motherboards
2 PSU`s or an 800w, 4 Graphics Cards 2x Cross firing, will it be possible to sync the CPU`s, now you enjoy got me thinking, what in the region of Liquid Nitrogen cooling.....
I think two is the max.
I do not believe you can do this. My experience have shown me that any multiple monitor display must all run sour of the same video card.
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