Is it bad for the GPU to oscillate between 0% and 100%?

Solution
You shouldn't see it bottom to 0%, unless you are at a load screen, but you will see fluctuations. If you stop getting 60 FPS, then if you are not near 99%, you may have a bottleneck, but if you do have 60 FPS, then that is simply V-sync limiting your GPU usage.
You shouldn't see it bottom to 0%, unless you are at a load screen, but you will see fluctuations. If you stop getting 60 FPS, then if you are not near 99%, you may have a bottleneck, but if you do have 60 FPS, then that is simply V-sync limiting your GPU usage.
 
Solution