The Razer Viper 8KHz performs better than the Razer Viper Mini for most uses, though both mice look similar. The 8KHz is slightly bigger and feels a little more comfortable, especially if you have medium or large hands. Performance-wise, it has a much wider CPI range that you can adjust more precisely and with very little variation. It also has a lower lift-off distance and an outstanding maximum polling rate of 8000Hz, which results in smoother movement, though we don't test for this. Lastly, the 8KHz features two side buttons on each side, while the Mini only has two buttons on its left side. That said, the Mini is smaller and weighs a bit less, so it may be a better choice for people with smaller hands, especially those using a fingertip grip.