Bottleneck them how? A Gpu doesn't need to be below 100% utilization, if you increase resolution, eye candy and add shading filters then the GPU usage can come back up to 100%.

Its only bottlenecked if you want it to be or if you need the frames to be higher then what your cpu is capable of, understand?

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If i play at 1080p High settings with a 1800x and the GPU is only running at 50-60% utilization then i can bump up my settings to Ultra and now it will run 70-80%, i can then DSR to 1440p and end up at 100% utilization for the same frame rate, my game however is sharper and more beautiful thanks to 1440p + Ultra settings instead of 1080p High.