RAM was purchased in 2017, has been used in a desktop build, never overclocked, I don't believe this RAM is capable of overclock. It is of the Corsair valueselect type, new at this link: https://www.corsair.com/us/en/p/memory/cmv16gx4m1a2133c15/corsair-memory-a-16gb-1x16gb-ddr4-2133mhz-cl15-dimm-cmv16gx4m1a2133c15
It is 1 stick of 16gb DDR4 2133 Mhz RAM. Works fine, I just upgraded to more RAM at a higher frequency.