Not a whole lot. Nvidia cards are not as efficient at mining compared to AMD ones.
1. Single gtx titan gets 300 mh/s [0].
2. There are two gtx titan chips in this card, so let's say 600 mh/s.
3. A rack should fit around 60 of these. This gives us 36 gh/s (gigahashes a second).
4. According to this[1] calculator you will get a whooping 0.00361597 BTC per day, which would be worth around $2.12. Tomorrow expected payout drops to $2.09. Electricity should cost you at least an order of magnitude more.
1. Single gtx titan gets 300 mh/s [0].
2. There are two gtx titan chips in this card, so let's say 600 mh/s.
3. A rack should fit around 60 of these. This gives us 36 gh/s (gigahashes a second).
4. According to this[1] calculator you will get a whooping 0.00361597 BTC per day, which would be worth around $2.12. Tomorrow expected payout drops to $2.09. Electricity should cost you at least an order of magnitude more.
[0] http://www.tomshardware.com/reviews/geforce-gtx-titan-perfor...
[1] http://www.alloscomp.com/bitcoin/calculator