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.

GPU rendering - TITAN V, GTX 1080 Ti

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

Blender 2.90: Best CPUs & GPUs For Rendering & Viewport – Techgage

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

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

Mid-2021 GPU Rendering Performance: Arnold, Blender, KeyShot, LuxCoreRender, Octane, Radeon ProRender, Redshift & V-Ray – Techgage

NVIDIA GeForce GTX Titan X 12GB Video Card Review

GPU rendering - RTX 2080 Ti, TITAN V

GTX 1080 Ti vs 980 Ti vs TITAN X vs TITAN BLACK vs 780 Ti vs TITAN / NVIDIA SPECS & NO BENCHMARK