Is it dangerous to run a GPU benchmark I wanted to see how my new 13" Retina MacBook Pro performed on GPU stress, so I downloaded some GPU benchmark apps.
In one of the apps, I set the resolution to the same as my screen, and I putted antialiasing to the max...

Then, when I launched it, my computer became (not surprisingly) unresponsive, I did managed to force quit the app though, at which time OS X triggered me an error panel, telling me that there was a graphic error (and I could signal it), but it didn't blocked anything.
A little bit later, after I ran another benchmark, a small black line appeared briefly on the screen (something like 0.5 seconds) and then disappeared.

Is it a normal behavior after a high GPU load ? Or should I worry about it ?
Is it dangerous for the CPU to go to its limits ? (my GPU is an Intel Iris one).

Thank you.
I've seen that error a few time on mine since updating to Yosemite. I've taken it in to get checked out and apple didn't find anything when running their tests. One thing I've done to keep it from popping up as much is to do a NVRAM reset. You can do this by restarting before bootup hold command + option P + R till you hear a second startup chime then release. This clears out some video memory and some other minor settings like volume etc.