HP proliant g6 ユーザーズマニュアル

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New DDR-3 Memory Benefits
Lower latency
24GB/sec with DDR-2
64GB/sec with DDR-3
25% power 
savings over DDR2
Voltage reduced from 1.8V to 
1.5V 
Thermal temperature sensors 
allow power down when idle
Flexibility
Unbuffered DIMMs
Registered DIMMs
Larger memory footprints
Increased slot counts with G6
Max Memory up to 24GB with U-DIMMs
Max Memory up to 144GB with R-DIMMs
Bandwidth doubles
DDR-2; 667MHz 4 channels
DDR-3; 1333MHz  6 channels