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Energy Consumption: Cool’n’Quiet and the Complete System

35 AMD CPUs Tested for Power Consumption
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The percent differences of energy consumption of complete systems with CPUs in Cool’n’Quiet mode is not significant.

35 amd cpus

The difference between the best Athlon X2 4050e with 73.4 W and the worst Athlon 64 X2 4800+ processor with 79.9 W is just 8.8%. When the processors alone were measured, the performance difference was 58.8%.

AMD’s Phenom sticks out when measured in a complete system: at 95.7 watts, the Quad Core model uses 15.7 W more than a classic Athlon 64, which represents a 19.7% increase.

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  • 0 Hide
    Anonymous , May 7, 2008 2:52 PM
    Excellent article! It would be nice to see similar article for Intel processors because even if they are less power hungry, the Intel chipsets are not the "greenest". I am just considering a 24/7 home server and this information is very useful for me. Thank you!
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    Anonymous , May 7, 2008 5:29 PM
    Good article! You have the wrong processor name listed for the 2.10 GHz G1 Brisbane as "Athlon 64 X2 4800+ EE". It should be 4000+. I was a bit confused when I read the performance charts and noticed two 4800+ listed until I realized the mistake.
  • 0 Hide
    zenmaster , May 7, 2008 5:33 PM
    I was glad to see you got some of the new 45w AMD Chips in there.
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    xoham , May 7, 2008 5:38 PM
    Intel is not the greenest if it is less power hungry? Do they not meet RoHS standard or something?
  • 0 Hide
    zenmaster , May 7, 2008 6:57 PM
    He said the "Intel Chipsets" are not the greenest.
    The are still built on the 90nm process.

    The P45 will introduce the 65nm process on the chipsets.
    The latest AMD Chipsets use the 55nm process.

    In regards to CPUs, The Intel CPUs generally use less than the AMD CPUs.
    He was simply pointing out that the CPUs lose some of the benefeit of their low power consumption due to the chipset.

    For lower-end chips sitting idle, the difference in power usage of the chipsets can be significant. If you are looking at a higher-end chip under load, the power usage of the chipset becomes nominal.
  • 0 Hide
    einheriar , May 7, 2008 8:13 PM
    besides that intel still has the memory controller as a separate chip on the motherboard, where as amd has that included on the chip.. therefor a higher chip power use might be offset by the absence of the external memory controller, which would become visible when idling ..
  • 0 Hide
    Anonymous , May 7, 2008 9:15 PM
    so my x2 4000 ee (in tables interpreted as one of 4800's - due mistake) isn't so bad after all, I don't care about 2w/hour, when I have 24" lcd :-)
  • 0 Hide
    Mathos , May 8, 2008 2:22 AM
    The extra power consumption on the Phenom is due to the fact that the NB/IMC voltage stays at 1.250v even when the rest of the processor is running in standby. Kinda of annoying that they put it that high, since with a bios that still has the p-states section you can easily under volt the IMC without losing stability, especially at stock speeds. That will cut down on the idle and load power usages drastically.
  • 0 Hide
    royalcrown , May 8, 2008 4:46 AM
    I like how review site all push efficiency now since AMD can't really compete on performance. Yawn.
  • 0 Hide
    jprevost , May 8, 2008 9:25 AM
    Bravo for a great technical article. I can't tell you guys how nice it is to see some great charts. Charts are good, and you guys are good at charts, just don't stop adding to them!
  • 1 Hide
    amdfangirl , May 9, 2008 7:14 AM
    xohamIntel is not the greenest if it is less power hungry? Do they not meet RoHS standard or something?


    Rohs = reduction of hazrdous substances, nothing to do with power consumption
  • 0 Hide
    Anonymous , May 9, 2008 7:57 AM
    This article, which btw is realy usefull for me atm - thanx, brought me an idea. What about to compare all pc hardware (e.g. motherboards, harddrives etc)in conjuction to power consumption. It would be realy advantage (at least for me :)  coz i speculate what hardware use to build up server which will run 24/7/365 considering energy cost to be as less as possible.
  • 0 Hide
    Anonymous , May 9, 2008 8:37 AM
    a similar intel test woud be nice.

    at least one could see, if intel's "nominal" TDP's are as regular as amd's.

    here we see, the phenom 95 watts DO HAVE 95 watts at maximum.
  • 0 Hide
    calyth , May 9, 2008 6:08 PM
    For the strange power consumption figures for the Phenom, try using the downcore option (it's on the Asus M3A32-MVP) and limited it to 2 cores, and disable the L3 if possible, and retest to see if the figures are comparable to the X2s.

    IMO the dynamic power used by the processor is a factor of frequency, voltage and probably the number of transistors. The Phenom has 2 more cores, and a much larger L3 cache. The Phenom core itself is fairly similar to the K8s, and should not exhibit that much power increase if you can match the setup of a typical X2...
  • 1 Hide
    mlmiller1 , May 9, 2008 9:43 PM
    Nice article!

    I would be interested to see a chart that showed how many watts it takes to do a multi threaded task. For example, a faster core(s) finishes the job quicker then can drop to its low power state. And also on how much work can be done in a distributed computing task. This would be similar to "it takes X-watts to complete a task.”
  • 0 Hide
    Anonymous , May 10, 2008 1:53 PM
    I´m happy with my X2 4000 Brisbane. With the progam CrystalCPUID I can automaticly manage the processor to consume just 5w per core until cpu usage reaches 60%, than changes to 2700Mhz 70w in less than 100ms.
    Its grate and more economyc than cool n´quite.
  • 0 Hide
    draxssab , May 12, 2008 1:54 PM
    Why my loved 64X2 5000+ Black edition is not in this test? I know that it's something efficient like other BE, but I would really liked to see it compared to others AMD processors.
  • 0 Hide
    Anonymous , May 13, 2008 12:56 AM
    Creating charts like these are very useful to system builders as well. System power consumption is not only limited to to power that system uses alone, with all the power used there is a good amount of heat generated.

    HTPCs is probably hit the hardest by this, and any other system that is placed in so called computer desks that have a closed cabinet for the PC. Hot running system increases heat generation and affects home/server room temperatures which also affects the power bill. Cooler running systems also lead to quieter system cause of the decrease of cooling fans.

    One Item I would also like to see tested are power consumption among motherboards. CPUs and GPUs are obvious that the higher the performance the more the power will be used, but how does it compare with motherboards.
  • 0 Hide
    Anonymous , May 13, 2008 7:30 AM
    The opteron processors, where they find themselves in this very interesting test
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    curiousburke , May 19, 2008 3:13 PM
    mlmiller1Nice article! I would be interested to see a chart that showed how many watts it takes to do a multi threaded task. For example, a faster core(s) finishes the job quicker then can drop to its low power state. And also on how much work can be done in a distributed computing task. This would be similar to "it takes X-watts to complete a task.?


    YES! Specifically, I'd like to see how much energy is used by each system if they have to do the same task for a given about of time ... like play a dvd for 2 hours.

    -m
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