OK,
extremes should run with the 9500 GT, but not liquid more like a slideshow. I know that many people play this game with older and not so powerfull cards. It's nice that it works, but to play constantlyat with 10-20 frames is not really good.
A game starts from 24 FPS to run liquid, in some games this value is even higher.
At the last time I could test some Cards with shipsim Ex. If you will play Shipsim Ex nearly fluid with high settings, is the minimum what you need a GTX 285, GTX 460 or Ati 5850.
As overview I've created a short list as a pdf. The test should only show a small overview of the performance with ship simulator extreme. For direct comparison please also look at test from expert sides.
I Know It's hard, but a modern game needs a current Graphic Card. My GTX 275 is also not enough any more, to play the new games i must buy a better one.
Regards
Thor
Please compare ship simulator not with games like Call of Duty, these are all built differently and have much smaller maps. It's better you look at benchmarks from TDU 2 or Crysis Warhead.