IBM water-cooled superlaptop

IBM and the Swiss Federal Institute of Technology at Zurich plan to build a water-cooled supercomputer whose surplus heat will be re-used to heat the university's buildings. The Aquasar supercomputer will be located at the ETH Zurich facility, and it will start operations next year, the partners said in an announcement on Tuesday.
The supercomputer will combine two rack-mounted IBM BladeCenter servers, each containing multiple blades with a mixed population of IBM PowerXCell 8i and Intel Nehalem processors. It is expected to deliver a peak performance of about 10 teraflops.
The installation will re-use heat directly for in-building heating. IBM estimates that the wate-rcooling scheme will reduce the system's carbon footprint by up to 85 percent and save up to 30 tons of carbon dioxide annually, compared with standard cooling approaches. The comparison calculations are based on average yearly operation of the system and on in-building heating energy being produced by fossil fuels, the company said.
The system is the product of an extended joint research project between ETH and IBM scientists, focused on chip-level water-cooling. It also encompasses a concept for "water-cooled data centers with direct energy re-use" proposed by scientists at IBM's Zurich Lab.
Aquasar's use of warm water rather than cold water for cooling is unique and IBM-patented, a spokesman for the company said. Water, which is about 4,000 times more efficient as a coolant than air, will enter the system at 60 degrees C. This will keep the chips in the system at operating temperatures below their maximum of 85 degrees C, according to IBM.

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