First, GPU bitcoin mining is dead. Bitcoin mining itself is dead. It's waaaaay to hard to make any money at bitcoins now.
Now other alt-coins are possible with GPU rendering such at litecoins, altcoins, dodgecoins, etc.
Even those are going down quick though. Quick history lesson coming....
Bitcoins were first mined with CPU's. This made it hard and slow and they were expensive. Then someone figured out GPU rendering. It was a lot faster. Coin prices dropped some as people mined them but even though GPU's were way faster, it would still take a while to mine them all so prices stayed high. Then someone figured out ASIC rendering. Cheap little USB devices that could mine like 100x faster than a GPU at 1/10th the cost.
This runined bitcoin mining, all the easy coins were found super fast with the new ASIC miners, only hard coins to mine, not worth the power, value dropped.
Then someone came out with scrypt-coin mining. This was for new types of coins, and was ASIC-miner-proof. They couldn't mine scrypt coins. Back to GPU rendering. AMD gpu's rocked for it, people were setting up 4-5-6 video cards in a box to mine coins, making decent money.
then that bubble got burst when cheap USB ASIC miners were out that could mine scrypt based coins. Now everyone is ditching their video cards, buying ASIC miners, they will mine all the easy coins and it will be done with, ala bitcoins fate.
Short answer, GPU mining it dead. A USB stick now can do what 5 video cards can do at 1/10th the price. You'll spend more in power for 2x290's than you will make anymore.