Very little bottleneck , read here.
https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/
Impact of PCI-E Speed on Gaming Performance
https://www.youtube.com/watch?v=1XNI1GactP8 PCI-e 1.1 vs 2.0 vs 3.0 Technical Demonstration
Very little bottleneck , read here.
https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/
Impact of PCI-E Speed on Gaming Performance
https://www.youtube.com/watch?v=1XNI1GactP8 PCI-e 1.1 vs 2.0 vs 3.0 Technical Demonstration