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IBM System xSeries System x3655 (Type 7985) compatible Black Diamond memory 4GB DDR2 ECC Registered RDIMM 667MHz. Compatible computer model: IBM System xSeries System x3455 (Type 7984), System x3455 (Type 7986), System x3655 (Type 7985), System x3455 (Type 7940), System x3655 (Type 7943). Black Diamond Memory offers the most extensive line of memory solutions today. With our decades of experience specializing in memory, Black Diamond Memory is a proven manufacturer to the semiconductor industry. Our great products combined with our world class service and support have helped us to where we are today. When you have an Black Diamond memory chip, you can count on it being the best available memory for your system. Our system specific Branded Memory line delivers in performance, and is designed to be guaranteed in compatibility with your system. Each of our memory chips come with a lifetime warranty for your peace of mind. Use our Upgrade Configurator to easily find the correct memory module for your system. Please keep in mind that this memory will ONLY work on the models listed above. 15% Restocking fee will apply for non-defective items.