Impact of retrofitted CPU water cooling on supercomputer performance and power consumption

Seppo Ovaska, Roy Dragseth, Svenn Hanssen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

3 Citations (Scopus)


Water cooling of servers is emerging to high-performance computing (HPC) platforms, not only due to the requirements on effective cooling of high-density server blades, but also for effective recycling of waste heat. In this poster paper, we compare the measurement results of two production-grade HPC racks of the Norwegian Stallo supercomputer: one with air-cooled CPUs and the other with retrofitted direct-to-chip liquid cooling. The performance and power consumption measurements were recorded for computer room temperatures 20-30 °C. It was observed that the median performance measures with water cooling were 0.8-1.4% higher than with air cooling; while the average power consumption with water cooling was 9.4-14.4% lower than with air cooling. During this study, the computation-intensive LINPACK benchmark was executed on all the servers.

Original languageEnglish
Title of host publicationSoutheastCon 2016
Number of pages2
ISBN (Electronic)978-1-5090-2246-5
Publication statusPublished - 7 Jul 2016
MoE publication typeA4 Article in a conference publication
EventIEEE Region 3 South East Conference - Norfolk, United States
Duration: 30 Mar 20163 Apr 2016


ConferenceIEEE Region 3 South East Conference
Abbreviated titleSoutheastCon
Country/TerritoryUnited States


  • computing performance
  • direct water cooling
  • high-performance computing
  • power consumption
  • waste heat recycling


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