Probably not. It is only certain parts of the code that can run on the GPU.
Think of it like a funnel. Each layer of the funnel is only so wide. The CPU feeds the GPU. If the CPU’s width (speed) is narrower than the GPU then it doesn’t matter how big the GPU is, it won’t increase the flow of results coming out of the bottom because your system is only as fast as its slowest part.
Hopefully this makes sense: (the blue is supposed to be your data)
If GPU usage is low and CPU is high you’re probably CPU bound. If GPU usage is high and CPU is low you’re probably GPU bound. If both are low you’re probably disk bound. And if both are high you’re probably just right.