The old one (a GeForce GTX 285) was getting too far behind the curve and kept crashing on me in The Secret World. Its replacement (a GeForce GTX 660 Ti) isn't top of the range either, but it should crash in The Secret World quicker. Its best feature so far is that its fans don't hum at a frequency that makes me think I have tinnitus in my left ear.
Installation wasn't too painful, except for the One Thing that always happens when a new graphics card goes in. That One Thing takes me half an hour to sort out.
Here's what my desktop normally looks like:
Here's what it looks like after installing a new graphics card:
When the card comes up first time, it squidges the screen from 1920x1080 to 800x600. Changing the resolution to what it should be doesn't put the icons back where they should be. Putting them all back manually is not fun. There's probably a simple way to save a desktop configuration so this doesn't happen, but that would entail looking up the solution on the Internet or something.
Other than that One Thing, though, it's looking good.