http://milkyway.cs.rpi.edu/milkyway/
or
http://boinc.thesonntags.com/collatz/index.php
All of these projects max out your GPU, just change preferences to use GPU always.
Reason why all these programs max out the GPU is because they run separate task per gpu, so 2nd gpu does not wait for work from main one, like it does in 3d benches.
I suggest you use GPU-Z 0.52, this is what I used and the consistency of the app taking the temp reading is the most important part of the test.
or
http://boinc.thesonntags.com/collatz/index.php
All of these projects max out your GPU, just change preferences to use GPU always.
Reason why all these programs max out the GPU is because they run separate task per gpu, so 2nd gpu does not wait for work from main one, like it does in 3d benches.
I suggest you use GPU-Z 0.52, this is what I used and the consistency of the app taking the temp reading is the most important part of the test.