With this survey, its 31st since 1993, the Top500 began measuring computer efficiency as well. The Top500 most energy efficient supercomputers are:

• IBM QS22 Cell processor blades (up to 488 Mflop/s/Watt)

• IBM BlueGene/P systems (up to 376 Mflop/s/Watt)

• Intel Harpertown quad-core blades are catching up fast

• IBM BladeCenter HS21with low-power processors (up to 265 Mflop/s/Watt)

• SGI Altix ICE 8200EX Xeon quad-core nodes, (up to 240 Mflop/s/Watt)

• Hewlett-Packard Cluster Platform 3000 BL2x220 with double density blades (up to 227 Mflop/s/Watt)

• These systems are already ahead of BlueGene/L (up to 210 Mflop/s/Watt).

• The average power consumption of a Top10 system is 1.32 Mwatt and average power efficiency is 248 Mflop/s/Watt.

• The average power consumption of a Top50 system is 908 Kwatt and average power efficiency is 193 Mflop/s/Watt.

• The average Power consumption of a Top500 system is 257 Mwatt and average power efficiency is 122 Mflop/s/Watt.
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