Top GPU cards performance comparison in Blender: GTX1080, Titan X, GTX980Ti and AMD R9 - BlenderNation

LionRender have done an in-depth test of four high-end GPU cards.

Home-v4 - BlenderNation

Is an Nvidia Titan Xp still pretty good for very intensive modeling work and rendering? : r/blender

Project CARS Benchmarked: Graphics & CPU Performance > Benchmarks: 1080p

NVidia Titan Xp Review vs. 1080 Ti: $200 Per Percentage Point Gained

NVidia Titan Xp Review vs. 1080 Ti: $200 Per Percentage Point Gained

Which one is better for Blender rendering? GTX 1660 Super or RTX 3060? - Quora

NVIDIA GeForce GTX Titan X 12GB Video Card Review

NVidia Titan Xp Review vs. 1080 Ti: $200 Per Percentage Point Gained

EVGA GTX 970 Hybrid Review & Benchmark

GTX 980 Ti Review & Benchmark vs. 980, Titan X, 780 Ti

Best Workstation Graphics Cards for Professional Work- Charts, Benchmarks and Details, Page 9