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The black/red Viper 4 DDR4 PC4-21300 32GB (4 x 8GB) 2666 MHz UDIMM Kit from Patriot comprises a set of four modules each of 8GB capacity, with a total of 32GB memory. These modules run on 1.2V and offer 2666 MHz clock speed. The Viper 4 utilizes a custom-designed, high performance heat shield for enhanced heat dissipation to ensure optimal performance while using taxing applications.