TeamGroup T-FORCE DARK Z FPS DDR4-4000MHz 2x8GB Kit Review — In Search of Its Limit on an i9-9900K/Z390 Platform

T-FORCE DARK Z FPS DDR4-4000MHz is a fast 2x8GB gaming memory kit that we are reviewing to see how high its frequency can go on an i9-9900K/Z390 platform. We received a review sample from TeamGroup who told us they cannot assure it can reach the advertised 4000MHz frequency on our CPU platform. We will search for its maximum stable and safe overclock and compare its performance against both its default JEDEC specifications (non-XMP) and our Kingston HyperX Predator DDR4-3333MHz 2x16GB memory kit.

t-force dark z

We currently use 2x16GB of HyperX Predator DDR4 CAS Latency (CL) 16 memory at 3333MHz (XMP profile 1) for our usual benchmarking PC. With this analysis, we will also check if this fast DARK Z FPS DDR4 memory kit is a good upgrade for our current testing setup.

Here are the two memory kits that we are comparing:

  • Kingston HyperX Predator PC4-26700 DDR4-3333MHz CL16 2x16GB kit
  • TeamGroup T-FORCE DARK Z FPS PC4-32000 DDR4-4000MHz CL16 2x8GB kit

The T-FORCE DARK Z FPS DDR4-4000 2x8GB kit is $139.99 at Newegg.

Testing Platform

Our testing platform is a recent clean install of Windows 10 Pro 64-bit, using an Intel Core i9-9900K at stock settings, a Gigabyte Z390 AORUS PRO motherboard, a Samsung 500GB 960 EVO NVMe M.2 and WD Blue 1TB SATA SSDs, and 16GB T-FORCE DARK Z FPS DDR4-4000MHz or 32GB HyperX Predator DDR4-3333MHz. We used the Gigabyte AORUS RTX 3080 MASTER at stock clocks for our testing. The settings, benchmarks, and hardware are identical except for the two DDR4 kits and frequencies we compare.

Both memory kits use CL16 and all Command Rates are 2T by their respective default XMP profiles. The T-FORCE DARK Z FPS is rated at CL16-18-18-38 and 1.45V using its XMP profile, but the HyperX Predator is CL16-18-18-36 and 1.35V (XMP profile 1). We will compare the performance of these two DDR4 kits and overclock the DARK Z FPS memory to chart the effects of different memory speeds on the performance of 5 modern PC games, including Call of Duty Warzone and PLAYERUNKNOWN’S BATTLEGROUNDS (PBUG) at a maxed-out/ultra 1920×1080 resolution. We benchmark using multiple well-respected memory-related benchmarking tools such as AIDA64, Sandra, Cinebench, and 3DMark.

Product Specifications & Features

Here are the memory specifications of the DARK Z FPS DDR4-4000MHz from the TeamGroup website:

t-force dark z fps
Source: TeamGroup Inc

Below you can also see a summary of the memory specifications from the Thaiphoon Burner tool:

Using its default XMP profile, the voltage is automatically set at 1.45V for 4000MHz but may be manually adjusted in the BIOS from between 1.20V to 1.50V – or higher. Here are the DARK Z FPS features as taken from TeamGroup’s website.


  • FPS is significantly improved by up to 20%[1]
  • No lag in-game is the key to victory
  • Sci-fi style outline
  • Selected high-quality IC chips
  • Supports O.C. Profile. One-click overclocking

TeamGroup offers a lifetime warranty for their T-FORCE desktop memory and DARK Z FPS is available only in black.

Let’s unbox the memory kit on the next page and take a closer look.