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Processor bottleneck is worse, than graphic card bottleneck, because utilization of your processor will be on maximum and it will throttle other programs that are ran in background. Also you won't experience maximal performances that your graphic card offers.
You can resolve this by upgrading your processor or by downgrading your graphic card. Downgrading your graphic card doesn't make much sense and in that case is better to leave current graphic card in you computer.
If you are experiencing processor bottleneck, increasing your resolution will have a high impact on your graphic card and it's utilization will increase. Also when you are experiencing graphic card bottleneck, lowering your resolution will allow your graphic card to process more data and achieve higher frames per second. More frames per second will put higher impact on your processor because it needs to prepare more data for your graphic card. You can reduce this bottleneck by changing your screen resolution to one of these resolutions.