Based on our results and findings, we do not recommend the DARK Z FPS 2x8GB DDR4-4000MHz CL16 memory kit for Z390/i9-9900K users since the one-click 4000MHz CL16 XMP profile doesn’t work out of the box or through any manual custom overclock we tried on our Z390 platform using what we consider to be a safe voltage.
In addition, we do not consider this DARK Z FPS 2x8GB DDR4-4000MHz CL16 kit a good replacement or upgrade for our HyperX Predator 2x16GB DDR4-3333 CL16 kit due to the minor and insignificant performance improvements we see in games. We feel that it would be unfair to give the DARK Z FPS 2x8GB DDR4-4000MHz CL16 a final verdict based on our Z390 CPU testing alone. Based on TeamGroup’s testing and data, these modules at 4000MHz XMP or higher OC frequencies are designed for newer CPU platforms, and we have no data on these testing scenarios.
Rodrigo González (aka “RodroG”) is an enthusiast gamer and tech reviewer interested especially in shooter games, open-world role-playing games, and software and hardware benchmarking. He is the author of the NVIDIA WHQL Driver Performance Benchmarks Series and founder and moderator of the r/allbenchmarks community on Reddit.