Is it a noise issue? If you take a newer open-air style card and lower the power limit it should be fairly quiet and still much faster than what you've got. You

Is it a noise issue? If you take a newer open-air style card and lower the power limit it should be fairly quiet and still much faster than what you've got. You can also tinker with limiting the clock speed and maybe get even lower, enough that you could take the fans off.