Source: Tom's Hardware – Keywords: amd, power, cpu
Categories: Hardware
Energy Loss: When Cool’n’Quiet Mode Doesn’t Work
Sometimes it is not possible to get the processor to go into Cool’n’Quiet mode while in standby. This may be due to an error in the BIOS, the operating system malfunctioning, or the motherboard crashing during the attempt; in some cases, the reason is unknown. Sometimes the dynamic down-switching of the CPU will interfere with active programs, so the user is forced to turn the economy mode off.
The BE processors have, at 3.2 W, the lowest energy loss, because their normal clock rate’s energy consumption is low. The Sempron 64 processors have to deal with 5.1 to 6.6 watts of energy loss. The energy efficient processors, while not in Cool’n’Quiet mode, have an energy loss of 5.2 to 10.7 W. The classic Athlon 64 models do the worst: the high energy-intake without Cool’n’Quiet mode is between 11.4 and 21.8 watts.
The Phenom does well, with about 8 W of energy loss, but when combined with the high intake it has during standby, it becomes 20 W—twice as much as any other CPU model.
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my media centre based on a 3700+ (S939, single core san diego, 1MB, 2.2GHz) only uses 56-58W while running rosetta@home! That's including 1.25GB DDR (3 sticks), a freeview TV tuner, and a 2GB compactflash card on a Seasonic S12 330W PSU. It's undervolted as far as it'd go though...
What about performance per watt comparisons, which would have been the best comparison you could have made in such an article.
If you had a system that consumed 300W of power (forget about idle and full load differences for this question!!) with a 500W PSU, what would your power consumption be for the purpose of energy bill calculation?
Am I correct in believing that the rating of your PSU is the maximum power it can supply, and that it only actually draws what the system asks for? So in this case, your overall system power use would be 300W?
So, if you install a much more powerful PSU than you currently need (for the sake of future SLI upgrades) you wouldn't be wasting electricity?