Monitor GPU performance on OSX Is there an application or tool that can monitor GPU performance on OS X? Specifically I would like to see the current speed/utilization and temperature of the integrated NVIDIA chip. 

For Windows, there is CPU-Z and MSI Afterburner. I cannot find anything for OS X, not even an NVidia control panel app.
You can use Activity Monitor that comes with MacOS in Applications>Utilities

Choose Window>GPU History

or press ⌘4