chrism,
sli is good for gaming, but can cause anti aliasing problems with photography work and defo not the way to go, this system certainly wont be gaming lol
bearing in mind that Vista hogs 800 mb of RAM just for sitting idly alone.
There again, my 8600GT runs two monitors just fine.

I'm not sure with hptography, but with gaming the best method at the minute is using multi GPU technology. With Nvidia it's called SLI (Scalable link interface) and with ATI it's called crossfire. Basicaly you use 2 graphics cards to power the display. I use Nvidia SLI, it works by using one GPU to render the top half of the screen and one for the bottom.
As I said, I use it for gaming, so not sure whether it'd have any merit for use in photographics.
You don't even need 2 GPUs for dual displays.
I know, I was saying that I use 2 GPUs to run 1 display, each card renders half the screenI can run up to 4 displays if I REALLY wanted to...can't think why I would though...
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