Never, EVER use bottleneck calculators. They are complete and utter garbage.
Everything boils down to:
- monitor resolution, refresh rate, and adaptive-sync tech (if present)
- what specific resolution you play on
- which specific games are being played
- what level of detail you want
- what frame rate you're aiming for
Some games are much more CPU intensive than GPU intensive, so the CPU might be the so-called "bottleneck" in that case.
Some games are much more GPU intensive than CPU intensive, so the GPU might be the so-called "bottleneck" in that case, even though it's the exact same system.
If your monitor were, say, 1920x1080 and limited to a 60Hz refresh rate, then your monitor would be the "bottleneck".
For CPU intensity - some games need faster clock rates and higher IPC, and may or may not utilize multiple-threads/cores well. Others may rely more on multi-core/multi-thread, etc.
But, anytime you even think of "bottleneck" . . repeat to yourself "All bottleneck calculators are utter garbage!"