The 1070 Ti is basically the 1070 with 25% more working CUDA cores (2432 versus 1920) and slightly higher base clock of 1607MHz (versus 1506MHz in the 1070). This translates to the 1070 Ti being nearly as powerful as the GTX 1080 which has 2560 CUDA cores, 8 GB of GDRR5X memory and boost clock of 1733 GHz.