i5 6600k DOES bottleneck gtx 1080 - CPUs, Motherboards, and Memory - Linus Tech Tips
RTX 2080 Ti benchmark with i5-6600K 1080p, 1440p, Ultrawide, 4K benchmarks at Ultra Quality - GPUCheck United States / USA
No, your i5 will not bottleneck a GTX 1080. : r/pcmasterrace
Will the i5 processor bottleneck me if I run the GTX 1080 Ti? - Quora
Will an i5 6600k bottleneck a 1080ti? - CPUs, Motherboards, and Memory - Linus Tech Tips
GTX 1080 Ti Fortnite Battle Royale benchmark with Intel Core i5-9400F @ 2.90GHz at Ultra Quality ? 1080p, 1440p, Ultrawide, 4K Performance Benchmarks - GPUCheck United States / USA