It's running at the base clock in the image you posted (within margin of error, the base clock will fluctuate a tiny bit around 100 MHz, which is normal).
If you think you have a CPU bottleneck, a couple things you could check are:
-Look at max CPU usage while gaming on any individual core. If it's close to 100%, probably a bottleneck.
-Try lowering resolution. If FPS doesn't increase significantly, probably a CPU bottleneck.
How much RAM do you have, and what speed?