Dark Rock Pro 5 offers an immense cooling performance and virtually inaudible operation. Excellent for heavily overclocked systems and demanding workstations. Add the DC2 Pro which is the thermal grease of choice for high-end chips that generate massive heat. The extremely high thermal conductivity makes for an exceptional heat transfer between the chip and the cooler. If you are a professional user or die-hard enthusiast striving for maximum cooling, DC2 Pro is the thermal grease of choice.