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CPU Overclocking vs. Power Consumption

B

burebista

Weaksauce
Joined
Dec 17, 2009
Messages
73
@XBit.
Oh well they did it again. After that article about video cards power consumption now it's for CPU's. :eek:
Without going too much into details about the design of this unit we would like to say that the advantage of this device over electrical meters, amperemeters, current clamp meters, shunts and voltmeters is that it not only provides more precise readings, but also allows to interactively monitor the current changes along different power lines. As a result, we will offer you not only the average results, but also the maximum power consumption readings. We will also check not only the current sent to the mainboard through a special 12 V processor power connector, but also the currents the mainboard receives via standard 24-pin ATX power connector along 12, 5 and 3 V power lines. We must take all this data into account because many contemporary processors, mostly the ones made by Intel, use combination power circuitry that involves not only the individual 12 V processor power line.
Click to expand...
 
Meh, most of us that overclock into the 4GHz range aren't too concerned with how much more power we are using :D

Also:

It is a very illustrative picture, I should say. Up until 3.4 GHz, the system power consumption increases little by little, by about 4-6 W per every 200 MHz. It once again confirms our assumption that overclocking without involving processor Vcore adjustment doesn’t affect the system energy-efficiency that much. However, as we pass 3.4 GHz mark, things start to change dramatically. Every additional 200 MHz result into 30-40 W power consumption increase. And that happens only because we keep pushing processor Vcore 0.1 V higher every step of the way to ensure that the processor remains stable.
Click to expand...

So at 4GHz they are running at around 1.5Volts on the vcore...
 
Nice little gadget they came up with. While it was obvious that OCing increases power demands it is nice to have something other than good guesses.

He forgot to mention the efficiency of the CPU voltage regulator on the motherboard will affect the readings but I imagine all good quality enthusiast motherboards are in the same ballpark. Actually now with his new toy and using a "benchmark" CPU at a specific frequency he should be able to compare motherboard CPU voltage regulation efficiencies and motherboard power requirements. Information we have not had before. However the poster before me makes a good point, once your heatsink starts glowing in the dark a few watts here and there are not a big concern.

Still, more information is a good thing in this case.
 
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