Excellent memory, but beware of the motherboard model
This memory runs like a rocket, which is quite exceptional for a 2x16Gb kit at this 4000 Mhz rate.
But you really have to be careful about the compatibility of the Motherboards (even the most recent ones) which support this speed in 32Gb version (2 x 16Gb bars), which has nothing to do with the same timings in 16Gb (2 x 8Gb bars). Do not hesitate to go to the official G-Skill website, and go to the "QVL" section related to memory.