The GIGABYTE UD PRO series SSDs adopt the TLC NAND 3D flash, which has a higher bit capacity, R/W speed performance, strength and reliability compared to the TLC 2D flash. In addition, with an optimized driver and firmware, the GIGABYTE UD PRO Series SSDs provide excellent performance for a smooth PC experience. External DDR3L SDRAM cache The UD PRO SSD is equipped with high-speed DDR3L SDRAM cache and does not need to reserve over-provisioning space, improving random read/write performance. This means that users can use the full capacity of the disk. In addition, external DRAMs can be a buffer between the controller and the NAND flash for sustained performance when the capacity is occupied by more and more data.