That doesn't bother because the price is really cheap but you sure it will work it says on my motherboard only 2133/2400It would work but you will not be able to run it at 2666 MHz. You'll be limited to 2133 MHz.
Due to Intel® chipset limitation, DDR4 2133MHz and higher memory modules on 6th Generation Intel® processors will run at the maximum transfer rate of DDR4 2133MHz.you sure it will work it says on my motherboard only 2133/2400