The G.Skill Trident Z Royal Series (4x 32GB) is one of many top-rated memory kits available on the market. It offers a timing of 18-18-18, which brings your performance up as much as possible without sacrificing stability or jeopardizing longevity.
The kit also comes with a free backplate, which will protect your memory modules from life's misfortunes. They can also work with other modern processors and the DDR4 standard. It is built using only hand-tested memory chips and overclocked at 4000MHz memory speed.