I have a GF card and was getting the "newest" drivers all the time as well. Then I noticed the FR went into the dumper. The newest drivers are made for newer cards than my GF2 mx400. I went back to an older driver and it really screams now.
Newer ain't necessarily better for drivers and nvidia doesn't tell you what card that the drivers are optimized for. In short, if you're happy, go with the flow.