Does Saving Power Mean Hurting Performance?

Test Setup And Benchmarks

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CPU I Intel Core 2 Extreme QX9650 (45 nm, 3.0 GHz, 12 MB L2 Cache)
CPU II Intel Core 2 Duo E8500 (45 nm, 3.16 GHz, 6 MB L2 Cache)
Intel Chipset : P45 MSI P45 Neo2-FIR, Rev. 1.0
Intel P45, BIOS: 1.1 B5
RAM 4x 1 GB DDR-1066 Crucial BL12864BA1608
HDD Seagate Barracuda 7200.11, 500 GB, 7,200 RPM, SATA/300, 32 MB cache
DVD Samsung SH-S183
Graphics Card GeCube Radeon HD 485, GPU: 625 MH, RAM: 512 MB GDDR3 (993 MHz)
Power Supply Cooler Master, ATX 2.3, 850 Watt
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Operating System Windows Vista Enterprise Version 6.0 (Build 6000)
DirectX 10 (Vista default)
DirectX 9 Version : April 2007
Graphics Drivers Radeon 8.7 (Vista)
Intel Chipset INF : 9.0.0.1008
Java Java Runtime Environment 6.0 Update 1
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Operating System Sysmark Windows XP SP2
DirectX 9 Version: April 2007
Graphics Drivers Radeon 8.8
Intel Chipset INF: 9.0.0.1008
Java Java Runtime Environment 6.0 Update 1