would this ram work on a motherboard that maxes out at 2133mhz?

As long as each port supports 8g of ram....then yes.

Questions & Answers: Timetec 16GB KIT (2x8GB) DDR4 2400MHz (PC4-2400T) PC4-19200 UDIMM Desktop RAM 288-Pin 1.2V CL17 Non-ECC Unbuffered DIMM Memory Module Upgrade

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Timetec 16GB KIT (2x8GB) DDR4 2400MHz (PC4-2400T) PC4-19200 UDIMM Desktop RAM 288-Pin 1.2V CL17 Non-ECC Unbuffered DIMM Memory Module Upgrade

Capacity 16GB RAM KIT (2 x 8GB Modules) Speed up to 2400MHz Non-ECC Unbuffered 288-Pin 1.2V UDIMM.
Specs PCB Color (Green or Black) and Rank (1Rx8, 2Rx8, or 1Rx16) may vary depending on production batch. Performance and quality remain consistent across all Timetec products.
Compatibility Designed for selected DDR4 Desktop PCs and workstations that support 288-Pin UDIMM memory. NOT compatible with Laptop SODIMM slots.
Installation Plug-and-Play Upgrade, Quick and Easy to Install, no expertise required (please refer to your system's manual for guidelines).
Warranty All Timetec products are high-quality and rigorously tested to meet stringent standards. Backed by Timetec Limited Lifetime Warranty and professional technical support based in the United States.