DDR4 2666 vs 3200 mhz RAM which is worth for gaming , Coffee lake build ?

2666 mhz vs 3200 mhz memory Is it there any difference ? in gaming & productivity ? Tested with intel 8th generation i5 8400 cpu with gtx 1060 6gb - Side by side comparison. Shown individual core turbo clock speed & all core turbo boost , total cpu usage, fps, frametime graph. 9 Games Tested @ low- medium settings 1920x1080 resolution Rise of the tomb raider Crysis 3 Battlefield 1 (bf1) Gta 5 Grand Theft Auto V project cars 2 Tom Clancy’s Ghost Recon Wildlands Far Cry Primal The Witcher 3 f1 2017