#10 China's Dawning 5000A is running Microsoft's new HPC 2008. It has an efficiency of 77% vs 75% for the Jaguar running CNL (compute node linux). Efficiency is RMax / RPeak.
And on one in the top 50 (ABE) it is a dual boot with Linux. The interesting thing is that Windows runs about 7% faster than linux on the same hardware. Installation for that cluster took 4 hours.
There is another dual boot further down the list and on that one Windows scored 14% higher efficiency than Linux on the same hardware.
I would love to see if Jaguar was running Windows HPC if it would take the #1 spot
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