GPU benchmark for nvidia Optimus cards

Question

I need a GPGPU benchmark which will load the GPU so that I can measure the parameters like temperature rise, amount of battery drain etc. Basically I want to alert the user when the GPU is using a lot of power than normal use. Hence I need to decide on threshold values of GPU temperature, clock frequency and battery drain rate above which GPU will be using more power than normal use. I have tried using several graphics benchmark but most of them don't use GPU resources to the fullest. Please provide me a link to such GPGPU benchmark.