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IBM Hydro Cluster Water Cooling  (Source: IBM)
IBM Power 575 performs at 600 GFlops per node

Computer enthusiasts that overclock their CPUs have known for a long time that liquid cooling has the potential to cool the processor better than air cooling. Liquid cooling in the enthusiast space is common and has even given way in the extreme performance categories to much more exotic means of cooling processors.

In the supercomputer realm companies like IBM have traditionally relied on air cooling for the CPUs via air conditioning for the room the supercomputer is in. IBM introduced its latest supercomputer called the Power 575, which is equipped with IBM’s latest Power6 microprocessor. The Power 575 has moved from air cooling to liquid cooling and thanks to the liquid cooling useing water-chilled copper plates located above each processor, the new supercomputer requires 80% fewer air conditioning units.

The significantly reduced need for air conditioning means that the energy needed to cool the data center can be reduced by 40%. IBM researchers say water can be up to 4,000 times more efficient than air cooling for computer systems.

The Power 575 supercomputer has 448 cores per rack and provides over five times the performance of its predecessor and is three times more energy efficient per rack. Each rack features 14 2U nodes each consisting of 32 4.7GHz cores of Power6 and 3.5TB of memory. Each node is capable of 600 GFlops and is three times more efficient in GFlops per kilowatt than the Power5 air-cooled processors.

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RE: its getting hot in.... where?
By jRaskell on 4/10/2008 12:29:34 PM , Rating: 3
I think it's safe to assume that, unlike most personal computer liquid cooling systems, for a computer of this size, the coolant is being pumped to external radiators that just use fans to cool with ambient outside air. the computer room is surely still air conditioned for the rest of the super computers components, but because the liquid coolant can more readily transport the majority of the generated heat to an external heat transfer device, the requirements on the AC system are significantly lower.

RE: its getting hot in.... where?
By afkrotch on 4/10/2008 3:26:22 PM , Rating: 2
I'm going to have to say, spot on. I imagine the external radiators standing outside the building being cooled by fans. Other ways could be placing external radiators over ventilation shafts inside the room and have a fan eject the hot air out of the building via the shafts.

I can come up with a bunch of different ways to reduce AC system requirements with such a system. Geothermal cooling comes to mind. Enough to cool a house, so why not a supercomputer.

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