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Power Requirements

Game Over? Core 2 Duo Knocks Out Athlon 64
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In contrast to all 90 and 65 nm Pentium 4 and Pentium D processors the Core 2 Duo processor family requires considerably less energy. All Core 2 Duo processors are rated at 65 W maximum power draw, whereas the Pentium D family is either 95 W or 130 W. Although these are the maximum power consumption figures, our tests show that the average power consumption is also cut into half, and the minimum power draw at low load and with energy-saving mechanisms enabled looks even better.

Processor Thermal Design Power
Core 2 Extreme X6800 75 W
Core 2 Duo E6700 65 W
Core 2 Duo E6600 65 W
Core 2 Duo E6400 65 W
Core 2 Duo E6300 65 W
Pentium D 950 115 W
Pentium D 840 130 W
Athlon 64 FX-62 125 W
Athlon 64 4800+ 95 W
Test System
Intel Core 2 Extreme X6800
Gigabyte ATI Radeon X1900 XTX
Asus P5WDH Deluxe
2x Western Digital WD15000ADFD
DVD-ROM 16x
PC-Power&Cooling Turbo-Cool 510 SSI
Terratec 7.1 Sound

An Intel system running any time of Extreme Edition processor typically draws at least 300 W when it is under full load. This is not the case any more: If you only replace the processor by a fast Core 2 model, you will receive more performance (see benchmarks) at a system power consumption that is in the area of 220 W. This resembles a 30% reduction in energy consumption, which directly relates to decreased cooling requirements.

Our measurements make very clear that the Core 2 micro-architecture makes a huge difference in power consumption. Using Core 2 Extreme X6800 reduces total system power consumption by as much as 30% under maximum load when compared to Pentium Extreme Edition 965, and by 12%/28% when idle (with/without SpeedStep). These numbers are particularly impressive if you take into account that Intel chipsets typically require more energy than chipsets for an Athlon 64 processor and, eventually, the processor has to be very frugal to reduce system power consumption that much.

Even if Core 2 Extreme is overclocked from 2.93 to 3.46 GHz the total system power consumption does not increase a lot. The 18% clock speed increase comes at a system power consumption increase of only 7%.
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