NVIDIA Optimus Graphics Calculator

I need a GPGPU test that will load the GPU so that I can measure things like temperature rise, battery discharge, etc. Basically I want to warn the user when the GPU is using more power than normal. So I need to define thresholds for GPU temperature, clock speed, and battery discharge rate above which the GPU will use more power than usual. I've tried a few graphics tests, but most of them don't take full advantage of the GPU resources. Please provide me with a link to such a GPGPU test.