Viper 3 4GB DDR3 1866MHz (PC3-15000) Single Memory Module - Black Mamba. "Patriot Memorys Viper 3 Series memory modules are designed with true performance in mind. Tested and compatible with Intels and AMDs DDR3 compatible processors and chipsets The Viper 3 series provides the best performance and stability for the most demanding computer environments. The Viper 3 series utilizes a custom designed high performance heat shield for superior heat dissipation to ensure rock solid performance even when using the most taxing applications. Built from the highest quality Build of Materials Patriot Memorys Viper 3 Series memory modules are hand tested and validated for system compatibility. Available in 4GB single DIMMs Patriot Memorys Viper 3 Series will be offered at 1600MHz - 2133MHz at 1.5V and 2400MHz 1.65V and are XMP 1.3 ready. Hand tested for quality assurance.