AA sometimes great, sometimes not

I'm trying to get to the bottom of my Anti-aliasing situation. In the settings available to me, I haven't noticed much difference, but there is some if I look closely. My video card was the top-o-the-line super-premo to die for card when I bought it, but its apparently now 2 or 3 generations behind (in terms of AA). Its an Nvidia GTX-480.

Anyway, sometimes the AA seems almost perfect. edges at odd-angles are crisp and clean and its almost like I'm looking at a photograph. Other times, the jaggies are massive and flickering like crazy.

I'm wondering what the difference is? Is it real geometry vs texture maps? texture maps with lines in them? something else? Station holograms usually have flickering jaggies in the smallish areas.

The station with the long thin vertical (when approaching the landing pad "upright") solar panel/windmill thingie is particularly bad, but geometry around the landing pad itself is fine, not a jaggy in sight. Perhaps its the thickness of the geometry (relative to my screen pixels); really thin things just aren't being A-A'd very well?

How are the newer NVidia, ATI, or whatever, cards handling this? This game tempts me to upgrade even though it consistently gets 60fps, and this card is fine in all my other games despite being long in the tooth (supposedly), although its a bit louder than I'd like when its really working hard.
 
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