These video cards are no longer overclocked, the average hash rate is 27-29 megahash.
https://2miners.com/blog/best-ethereum-mining-software-for-nvidia-and-amd/
"The only open-source mining software Ethminer came third. It doesn’t charge a developer’s fee, so hashrates in the program and in the pool are almost identical with a 0.01% difference. As you can see, if mining software is free, it doesn’t mean that you get more profit. If you choose Gminer or T-rex, you gain more."