Commited, I've been trying to find a link to some Detonator 2 drivers for you, and haven't had any luck yet.
The Detonator 3 drivers are unified, and will work with your card, but will provide more benefit for newer cards. In other words, the new drivers will work, but won't boost performance much. I've read that older cards may benefit more from the older (Det2) drivers that were written for them.
I had a TNT card that ran the Det2 drivers beautifully, but I don't remember the version and they're not on my system anymore. I'll keep looking, but you might try to reach out to some of these folks with TNT2 cards and ask what they're running. Good luck.