My mistake, I was checking the fps by double pressing f11 on a single player game which was not during the benchmark testing (i’ll edit my post). You’re right, I used steam’s in-game fps tool and the frames are much lower between 25-30 fps in all graphics settings.
I installed MSI Afterburner and checked the GPU usage during the benchmark test. The GPU is being used 80-85% on low and medium graphics preset, and 97-99% during High and ultra graphics preset but rarely reaching 100%. Nonetheless, My CPU is 100% in all of the tests.