AMD Unleashed: Four CPUs, Two GPUs, All Overclocked

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Power Consumption

Power Consumption

As with our SBM systems, power-savings options were turned off in the BIOS, and Windows Vista’s power-savings feature was set to High Performance. Let’s take a look at the total system power usage measured from the AC source. We’ll include a chart for the Radeon HD 4870 and a second while using the Radeon HD 4870 X2. Keep in mind that the Athlon 7750 uses a different 650 W power supply than the other three processors do. But again, both PSUs share similarities and are rated by Antec with up to 85% efficiency.

At stock speeds, the Phenom II X3 720 BE consumes the least power in each test. Once overclocked and running at full CPU load, it consumes about the same amount of power that the Athlon 7750 does. Without turning on power-saving features, the Phenom IIs clearly offer quite a bit more bang per watt than the previous-generation AMD processors.

Idle consumption doesn’t go up all that much with the Radeon HD 4870 X2, but under load we clearly see the increase in 3D performance doesn’t come without a substantial increase in energy consumption.

Paul Henningsen
53 Comments Comment from the forums
  • setting aside 1366 and AM3

    In 2 or 3 years when QX9770 chips start showing up for $250-$300.

    Will AMD have a cheaper socket AM2+ compatible chip on the market that will outperform it?

    If so, AMD would be a nice alternative.
    Reply
  • setting aside 1366 and AM3

    In 2 or 3 years when QX9770 chips start showing up for $250-$300.

    Will AMD have a cheaper socket AM2+ compatible chip on the market that will outperform it?

    If so, AMD would be a nice alternative.
    Reply
  • In 2 or 3 years Intel will have 16 cores on a single cpu, and amd tech will, as always, be useless, outdated, and worthless... Just like they are now.
    Reply
  • radguy
    So did I miss somthing or where does it say what each of these processors is overclocked to. I get that the p2 x3 720be is at 3.67 but what about the rest of them. Am I missing it somewhere (very possible) or do I have to look back at your previous articles to figure it out? shouldn't that be on the test systems and configuration page. I am trying to sort through the data.
    Reply
  • dirtmountain
    Nice article Paul and some exhaustive work! Don't overlook the 780G/SB710 that also feature ACC for a price of $72
    http://www.newegg.com/Product/Product.aspx?Item=N82E16813157154
    making the Phenom2 x3 720 a viable option in the SBM budget category. I'm also going to be curious about the new Phenom2 x2 and Athlon2 x2 processors that are coming out June 2nd.
    Reply
  • apache_lives
    Has anyone noticed the benchmarks for the i5's on anandtech yet?
    Reply
  • nerrawg
    Great article guys - love the comparisons to the SBM machines - really gives some insight into CPU and GPU scaling and how much to spend on your processor versus your graphics for gaming builds. Thanks!
    Reply
  • Sihastru
    apache_livesHas anyone noticed the benchmarks for the i5's on anandtech yet?
    I did. Considering the pricing scheme of the i5 (so close to AMD) and it's high performance numbers (so close to the i7) AMD is in big trouble.

    Intel will shift all the processors that are now under the i7 (even if the 920 is rumored to become EOL, one step down on it's portfolio, which means high end Intel dual cores, will go into or under the mainstream, where AMD already has a hard time.

    This doesn't make me very happy, even if I am an Intel fanboy. Aggressive pricing schemes are overrated. AMD needs something new. Now.
    Reply
  • DjEaZy
    ... BIG THX to the Tom's crew... was not so hard after all? ... now, thx to YOU, we have a info about intel, nVidia and AMD/ATi solutions... how they stack up in price/performance/cost of ownership... NICELY DONE!!!
    Reply
  • erdinger
    Yes thanks, many people complained in the system builder marathon and you listened to the complaints... great.
    Reply