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