Please note: This is server memory, Desktop PC cannot be used, X99 motherboard can be used. Application type: Server Memory types: PC4 4DRx4 ECC REG Memory capacity: DDR4 64GB Memory frequency: PC4-17000 2133Mhz Memory voltage:1.2V 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 will not affect its use. Colour:random colors, don't accept the specified color Material:PCB Package Contents: 1 x 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.