Wccftech posted a review on the G.Skill Trident Z Royal RGB 16 GB (2 x 8 GB) 4000 MHz CL17 DDR4 Memory Kit A quote from the article:

The G.Skill Trident Z Royal RGB series memory kit is definitely an eye-catcher and rocks an impressive specifications list with blistering fast speeds of 4000 MHz, solid overclocking performance and one of the best RGB implementations for memory modules in the industry.

 G.Skill Trident Z Royal RGB 16 GB (2 x 8 GB) 4000 MHz CL17 DDR4 Memory Kit Review