No problem, I hate superstition as well. I have more links below that are worth taking a look at. Because you're wasting your time with synthetic benchmarks like Firestrike. It means nothing at all in real applications. No correlation or causation. Sometimes I wonder if people would prefer their system was #1 on the 3DMark charts and #10 in real-world performance. As long as a benchmark validated their feeling that it was fast. Yes like everything, there is some overhead to Thunderbolt. It's in worst-case scenario after accounting for overhead you have 4GB/sec of bidirectional data transfer to work with. Its been proven that 4GB/sec is more than enough for a 980 and from results I've seen elsewhere online, a 1080 is still not bottlenecked in any way except maximum FPS- at resolutions you should never be using a GTX 1080 with anyway in 200FPS+ scenarios. Once the resolution goes up, it's not even worth discussing the difference between Thunderbolt 3 and PCIE 3.0 x16 links. For reference, Thunderbolt3 is roughly on-par with PCIE 1.1 x16 or PCIE 3.0 x4. Hard evidence, not superstition, feelings or mythology- 1. http://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/21.html 2.http://www.guru3d.com/articles_pages/pci_express_scaling_game_performance_analysis_review,7.html Try to enjoy your system.