TechPowerUp posted a review on the Razer Viper 8K
A quote from the article:
Razer updates the wired Viper with 8000 Hz polling and their Focus+ 20,000 CPI sensor. Other than that, it's essentially the same mouse: Razer optical main button switches, 69 g lightweight design, and pure PTFE feet.Razer Viper 8K Review
