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35 AMD CPUs Tested for Power Consumption

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Energy Consumption: Burdening the Complete System to the Maximum

The energy consumption of the complete system is not good when the energy hungry CPUs are loaded to the limit. The energy saving Sempron 64 3000+ needs, under full system load, 97.0 watts, 70.1 W of which fall away through the system.

The hungriest processor, the Athlon 64 X2 6400+, needs 177.3 W, while 73.9 W are due to the system. In total, it needs about 3.8 W more.

35 amd cpus

The Phenom slides into second last place when fully loaded. When processors alone were being tested to full capacity the Phenom 9600 did better, at 8.07 watts behind the Athlon 64 X2 6400+. When the complete system is measured, the gap is reduced to 2.11 W.

22 Comments Comment from the forums
  • 07 May 2008 21:52
    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!
    Reply
  • 08 May 2008 00:29
    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.
    Reply
  • zenmaster 08 May 2008 00:33
    I was glad to see you got some of the new 45w AMD Chips in there.
    Reply
  • xoham 08 May 2008 00:38
    Intel is not the greenest if it is less power hungry? Do they not meet RoHS standard or something?
    Reply
  • zenmaster 08 May 2008 01:57
    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.
    Reply
  • einheriar 08 May 2008 03:13
    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 ..
    Reply
  • 08 May 2008 04:15
    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 :-)
    Reply
  • Mathos 08 May 2008 09:22
    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.
    Reply
  • royalcrown 08 May 2008 11:46
    I like how review site all push efficiency now since AMD can't really compete on performance. Yawn.
    Reply
  • jprevost 08 May 2008 16:25
    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!
    Reply