Hexus posted a review on the G.Skill Trident Z 16GB DDR4-3000 (F4-3000C15D-16GTZ)
A quote from the article:
Gorgeous on the outside, but is it good on the inside? DDR4 is DDR4 is DDR4, right? Our benchmarks of previous memory paints this picture because the latest Intel processors hold so much clever cache as to render faster system memory almost redundant.G.Skill Trident Z 16GB DDR4-3000 (F4-3000C15D-16GTZ) @ Hexus
Yet while the JEDEC official standard remains a paltry 2,133MHz for the latest Intel Skylake, constituting a perfectly serviceable speed in most scenarios, the evolution in DDR4 manufacturing now means that 2,800-3,000MHz memory is barely any more expensive to produce. That being the case, it's no wonder that we're seeing a plethora of those kits flood the marketplace.