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UPDATE: Core i7: Blazing Fast, O/C Changes

Platform Power Consumption--Higher Than Core 2

SpeedStep with only 1.6 GHz

As a result of the Overspeed Protection feature, the power consumption of the Core i7 can not exceed 130 watts unless the feature is turned off; the specified TDP is the same for all three models launching today. The core of the Core i7 processors can reach up to 100° Celsius before it begins to reduce its clock speed and voltage with the help of its Thermal Monitor 2 (to prevent damage from overheating). Its SpeedStep feature reduces the multiplier to 12x when the cores are idle, lowering the CPU clock speed to 1.60 GHz. According to CPU-Z, the core voltage is simultaneously reduced to 1.137 volts.

Power Consumption

The Core i7 and Intel motherboard worked together very smoothly, with the board able to switch off some of its voltage regulation modules when idle, using the SpeedStep feature. Thanks to its improved power saving features, the Core i7 only draws between 1.5 and 2.7 watts when idle—that is a marked improvement over the Core 2 QX9770, which draws more than four times as much power. Under full load, the two processors are tied, with each consuming about 100 watts. Therefore, the Core i7 is no worse, but also no better than the Core 2 under load (not counting its performance per watt).

At the system level, the picture isn’t quite as rosy for the Core i7. Under full load, the Nehalem system draws 28 watts more than our Core 2 rig, and even when idling, its power consumption is still 10 watts higher. Since the power consumption of the memory interface is included in the CPU’s overall power consumption, that begs the question of which component on the motherboard is drawing the extra power. After all, our Core i7 system only has to power one extra component: a DDR3 module that draws between 4 and 5 W.

  • joseph85
    Good article, and may I say Keep up the good work.
    Reply
  • pullmyfoot
    AMD’s HyperTransport protocol can transmit up to 25.6 GB/s at 3.20 GHz.
    You mean Intel don't you? Other than that little mistake, good article
    Reply
  • wh3resmycar
    hmm, question. once this nehalems come out. will we ever see a dieshrunk c2q again after the penryns? im expecting the price of this procs along with the mobo and ram to be too far off from my budget. or
    Reply
  • skywalker9952
    One of the first side effects of Intel's domination of the CPU market is beginning to show. Since they don't have to compete with AMD in any market segment the i7 occupies, they have limited (significant) overclocking to only extreme models.

    RIP AMD.
    May Abu Dhabi restore you to life soon so we don't have to suffer through more Intel ripoffs.
    Reply
  • sonar610
    "The fastest Core i7, the 965 Extreme, is more than 2.6 times as fast as AMD’s current flagship CPU, the Phenom X4 9550 BE."
    This seems like an editing mistake maybe it should be 9950BE.
    Reply
  • cryogenic
    Core i7 is a great CPU, the article is not. I can't believe after all this time you still stack overclocked CPUs with unoverclocked ones. It's great to find out the overclocking potential of Nehalem but, at least include some overclocked Penryns in there too, to see how overclocked Nehalem stacks agains OTHER overclocked CPUs, because it's fairly evident that and overclocked new gen CPU will stack well with older non overclocked ones.

    Reply
  • joseph85
    CryogenicCore i7 is a great CPU, the article is not. I can't believe after all this time you still stack overclocked CPUs with unoverclocked ones. It's great to find out the overclocking potential of Nehalem but, at least include some overclocked Penryns in there too, to see how overclocked Nehalem stacks agains OTHER overclocked CPUs, because it's fairly evident that and overclocked new gen CPU will stack well with older non overclocked ones.If it's evident then who cares?
    Reply
  • fender22
    skywalker9952One of the first side effects of Intel's domination of the CPU market is beginning to show. Since they don't have to compete with AMD in any market segment the i7 occupies, they have limited (significant) overclocking http://en.wikipedia.org/wiki/Overclocking to only extreme models.RIP AMD. May Abu Dhabi restore you to life soon so we don't have to suffer through more Intel ripoffs.
    My thoughts exactly... I wonder if there will be some sort of resistance to this sort of thing... It's like buying a car, you can do whatever you want to it (within the limits of the law) to make it as fast as you want. Sure, you may void your factory warranty, but it's your deal. You don't see car companies making it impossible for you to do what you want to their cars so you have to buy their expensive high end just to get your kicks... (not a perfect comparison, but it works)

    I dunno, it's just pretty weak. And they are just taking advantage of the situation...
    Reply
  • cangelini
    sonar610"The fastest Core i7, the 965 Extreme, is more than 2.6 times as fast as AMD’s current flagship CPU, the Phenom X4 9550 BE." This seems like an editing mistake maybe it should be 9950BE.
    Fixed, thanks!
    Reply
  • onearmedscissorb
    Aside from the all too prevalent and potentially misleading typos, which someone needed to get a handle on as of months ago, I must say that the overall quality of this article is MUCH better than pretty much anything I can remember of the last few months. It's actually informative and thought out, rather than being a mess of assumptions that many people reading already know better than.

    Keep it up, and maybe I'll pay attention to this site like I used to.

    But just for the record, I don't believe that it's particularly appropriate to use the overall average performance percentages as a basis for comparison between the "speed" of Core 2 vs. Core i7. Obviously, most people are going to be interested in the difference with games, where it's likely to be pretty minimal. But here and there, you have something like the 55% WinRAR difference pretty much skewing what otherwise would have been an accurate depiction of average expectations across the board.
    Reply