I currently own a GTX 260 and I really don't see a point in updating the drivers anymore. The newer updates really improve performance for later cards and don't make mention of anything that would be beneficial to the overall performance of this card, so I ask, is it worth it to update this card?
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I would still update the drivers. Its not that hard and migt as well. expect a .00001% gain in power lol.
I wouldn't bother updating at this point, Nvidia's driver team isn't going to be working hard supporting a nearly four year old video card. I'd say don't bother unless you really need a newer revision to get a new game to work properly.