Application type:Server Memory types:PC4 2Rx4 REG ECC Memory capacity:DDR4 16GB Memory frequency:2133Mhz PC4-17000 Memory voltage:1.2V Please note: This is Server Memory, Desktop PC cannot be used, X99 motherboard can be used. DDR4 type: PC4-17000 = DDR4 2133MHZ PC4-19200 = DDR4 2400MHZ PC4-21300 = DDR4 2666MHZ PC4-22400 = DDR4 2800MHZ PC4-24000 = DDR4 3000MHZ PC4-26400 = DDR4 3300MHZ PC4-26600 = DDR4 3333MHZ Due to different batches, there may be differences in the appearance, color, and printing of the product, which not affect its use. Colour: Random Color(Note: The color is random and no specification is accepted) Material: PCB Package Contents: 4 * RAM Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.