Graphic card uses?

[tubbiesss]

I need to first apologize for starting a thread asking this really noob-ish question.

But just curious whether or not I would actually have a need for a powerful graphic card.

 

All this while, whenever possible, I usually try to get the fastest graphic card I could afford, just in case I need to play some graphic-intensive games. These "just in case" never happened (because I'm not much of a PC gamer), and even if they do, I ended up already having a whole new system, again with the fastest graphic card (last purchase I opted for a 5970 solely for playing Starcraft II).

 

But when trying to setup up a hackintosh system, I was unable to get the miniDP on the 5970 to work, so just a few days ago I got a 6870 cos I read that it is the currently highest graphic card Lion could support.

What I miss is that the 6870 is currently the highest AMD card and found out that that the "fermi" GTX570/580 are already supported in Lion *facepalm*

 

Now if I am certain that I wouldn't be gaming at all on my hackintosh, should I stay with the 6870 and stop this chase trying to get the fastest graphic card? Will it be sufficient to run Lion as smooth as it should @ 2560x1440 single display?

Or a better question would be: is the graphic card responsible for anything else other than gaming?

Thanks in advance