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The ever increasing power requirements for new denser servers has created the need for supporting higher density compute platforms within traditional datacenters. HP partnered with Rittal GmbH & Co. KG and Liebert Corporation to establish a test environment for measuring and validating the benefits of cold aisle containment and validating the constraints of operating in a 24-inch raised floor plenum using direct expansion computer room air conditioners (CRAC). Test results show that Cold Aisle Containment (CAC) enables higher density loads, provides a more consistent air supply, and uses mechanical cooling equipment significantly more efficiently.