Wow talk about tower of Babylon.
Each poster here is using a different meaning to the word bottleneck.
If you take OP's question literally – of course the GPU can't bottleneck the CPU, since it's not dependent on it for normal operation. You can run any CPU intensive task even with the iGPU and nothing will be affected.
But, a bottleneck is defined as a part or parts that limit the system as a whole, i.e. limit the performance of the entire system. And since this is a hardware section of a gaming website I assume the OP is gaming with his computer. In that regard, the GPU is a bottleneck for the entire system, since everything else has to wait for it. It is the weakest part the computer.
Games don't run at 60FPS because the GPU can't process data fast enough, in the meantime the CPU is not utilized 100% (less than optimal for performance).
Saying that the GPU is not a bottleneck to the CPU because the CPU can do other things is oversimplification of the term. One could argue that the GPU is not a bottleneck for the computer since it can run Prime95 without problems (the GPU will not affect the speed of the calculations). You need to look at the performance of all the parts for a specific scenario and not generally.
When asked if a part is a bottleneck, the said part has to be utilized to check if it a bottleneck.
It's like arguing that a HD4850 is not a bottleneck for copying files from drive c to drive d.
Of course not, since it has nothing to do with it.
To check for a bottleneck you need a scenario where both parts are needed, and see which part limit the performance of the entire system. In games at normal resolutions, generally the GPU will limit the performance.
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