Many folks obsess over cpu and gpu usage statistics; at lower res (1080 or below), the cpu usage will be higher, and, at high res, the gpu will be higher. The FX6300 is essentially a 3-core hyperthreaded cpu, so, it's cores will be pretty busy keeping up with any GPUs capabilities, save for at perhaps the highest resolutions...(even an i5 can keep with an OC'd i7 at 4k/ultra....
Most folks should check framrerates, and spend less time worrying about precise CPU utilization rates.
I would expect framerates to double (from FX6300 to 7700K)at low res in many games, assuming no vsync or botched chipset/driver isntall version issues exist...
The 7700K almost doubles framerates compared to FX9590 at 1080P in this comparison. Doubt those...