HD 6870 to nVidia GTX 680

It is possible. The only thing that the specs you posted don't show is what PSU it has. That's the only thing that could hold you back, but I would assume that it's OK. Remember that fiddling around in this system might Void any warranties you may have.

There are plenty of videos showing how to actually change the video card of your PC.
 
sure,the only thing you need to check is your PSU.i think 600W is better for you to change the video card.
 
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