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Results: Power Consumption And Efficiency

AMD A10-7850K And A8-7600: Kaveri Gives Us A Taste Of HSA
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I’d argue that this stuff is more fun than the actual performance benchmarks. We get to see how quickly each processor cruises through our suite, we measure instantaneous power consumption along the way, and then we're able to calculate what that data means to overall efficiency in the tests we’re running.

The line chart is admittedly messy, but it shows you that there’s actually something being logged as our benchmarks run. Each platform has 30 minutes of idle time inserted at the end of the suite, where we record power on the Windows desktop, just to ensure we’re not exclusively reporting results under load.

The outlier is AMD’s 45 W A8-6500T, which maintains remarkably low power draw through our workloads, but takes a long time to finish up. It’s a bold strategy, Cotton. Let’s see if it pays off in the efficiency chart.

Hidden under all of those lines, the A10-7850K (red) and A8-7600 (black) track very closely throughout the scripted sequence, even though one is a 95 W part and the other has a 65 W TDP. I went back and re-ran the -7600 using Disabled, 65 W, and 45 W options in ASRock’s Configurable TDP firmware setting, verifying that this feature works as it should.

Averaging power consumption confirms that the Kaveri-based parts end up really, really close to each other. Given the A10-6800K’s average use almost 20 W higher, the -7850K doesn’t appear to exploit all of its power budget to max out performance.

Both the Core i5-4670K and Core i3-4330 average lower power consumption through the Tom’s Hardware benchmark suite. Now we want to know how long each processor takes to finish the job.

Those same Intel CPUs end up being the first- and second-fastest through our benchmarks.

We can’t script the game tests, so 3D performance isn’t a component in these charts. You’re seeing the result of content creation, media encoding, productivity, and compression workloads. Any time you fold in gaming and compare AMD's Radeon R7 engine to HD Graphics 4600, the Kaveri design wins consistently. Whether or not an APU can deliver the frame rate, detail setting, and resolution you want to use is another matter entirely. Still, context is important here because Steamroller just doesn’t do much for the high end of Kaveri as it exists today. There’s a lot more to like at lower power levels when you compare inside of AMD’s portfolio. But once you add low-power Core i3s to the mix, again, Intel comes out on top.

Multiply power consumption across the duration of our test suite and this is what you get. The flagship A10-7850K is notably more efficient than the Richland-based A10-6800K, partly because it’s a little faster, but mostly as a result of lower power use. That doesn’t stop the $140 Core i3 from burning close to 50% of the A10’s energy, though.

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  • 13 Hide
    vertexx , January 16, 2014 5:30 AM
    While the gaming enthusiast may not have much here to get excited about, I think the real story here is the A8-7600. Especially at 45W, the numbers are quite impressive for this part.

    Of course, the other part of this story will be the adoption of HSA and Mantle. In this regard, I think AMD is playing its cards right. If you want to provide incentive for game developers to invest in developing for Mantle, that economic incentive is not going to come from providing a high-end part that tries to compete with high-end discrete GPUs. That economic incentive, and I believe it's huge, is in lowering the cost of entry to play your game.

    With the A8-7600, I believe AMD is providing a tremendous market opportunity and incentive if, with the combination of Kaveri plus embedded technologies (Mantle & True Audio), you can provide a playable gaming environment for the mass market. Admittedly, it may not be a "playable gaming environment" from an enthusiast standpoint, but as an entry point, it is quite good enough. It will be important for AMD to show that the release of Mantle for BF4 impacts performance for the Kaveri APUs in particular. More specifically, they will need to show that Mantle makes BF4 playable on a 7600. If they are successful in that regard, then I think they may really have something exciting here.

    I'm hoping AMD is successful in this, because it's obvious that the desktop CPU performance race has reached a point of diminishing returns. Kudus for AMD for potentially changing the game in the industry.

    All that said, they screwed up the pricing for the high-end. It needs to be $30 cheaper, and what is even the point of the 7700K? The 7850K at ~$145 and the 7600 where it is would have made much more sense if they want to incent adoption of this technology. The other point is they need to get motherboard manufacturers on-board with bringing more ITX FM2+ motherboards to market at different price points.
  • 11 Hide
    Someone Somewhere , January 16, 2014 4:23 AM
    Quote:
    A10-7850k is slower than A10-6800K ?? WTF.


    I got the opposite impression. Which graph are you looking at?
Other Comments
  • 0 Hide
    vipervoid1 , January 16, 2014 3:54 AM
    Somethings with Diagram u provided at page 9 ~ Core i5 4760k @@Please fix that ~
  • 1 Hide
    Someone Somewhere , January 16, 2014 4:10 AM
    Yeah, almost all the diagrams refer to the 4760K.

    Given that AM3+ looks like it's done, it would have been nice to see a 6-core chip. Still, one of these may end up in my next laptop.
  • 1 Hide
    cangelini , January 16, 2014 4:21 AM
    Will get the charts fixed shortly--thanks for the catch!
  • 11 Hide
    Someone Somewhere , January 16, 2014 4:23 AM
    Quote:
    A10-7850k is slower than A10-6800K ?? WTF.


    I got the opposite impression. Which graph are you looking at?
  • 8 Hide
    Jaroslav Jandek , January 16, 2014 4:24 AM
    Thank you for the article (especially the power consumption measurements), Chris. It is definitely an improvement over Richland but kind of boring (disappointingly expectable).

    I really like where AMD is going (HSA, GCN and TrueAudio).Too bad the manufacturing process of GlobalFoundries just can't match Intel's.

    Also, it would be interesting to see the new Bay Trail Pentium or Celeron CPUs (whichever is closer in performance) in the Efficiency graphs.
  • -1 Hide
    Someone Somewhere , January 16, 2014 4:25 AM
    I'm fairly sure that this is on TSMC's 28nm node. GlobalFoundries can't do that yet; this is on the same process used for AMD GPUs currently.
  • 0 Hide
    Jaroslav Jandek , January 16, 2014 4:45 AM
    Quote:
    I'm fairly sure that this is on TSMC's 28nm node. GlobalFoundries can't do that yet; this is on the same process used for AMD GPUs currently.

    28nm SHP from GlobalFoundries. AMD bought over $1 billion worth of wafers from them in december...

    I guess you have been reading the articles from a year ago about AMD still using TSMC despite promises of GlobalFoundries' new 28nm SHP process.
  • 9 Hide
    jacobian , January 16, 2014 5:12 AM
    I don't really believe into the whole HSA smoke-screen. By the time HSA-enabled apps take off, you will be ready to upgrade from your CPU again. The one terrible truth that stands out right now is that at current prices, the flagship Kaveri A10 doesn't make any sense whatsoever. Kaveri A8? Maybe. Richland A10-6790K? Perhaps. But the Kaveri A10 at $180 is a just a joke, specially after all that hype.
  • 3 Hide
    Someone Somewhere , January 16, 2014 5:16 AM
    CPUs are usually released at ridiculous prices, and come down over a month or two.
  • 13 Hide
    vertexx , January 16, 2014 5:30 AM
    While the gaming enthusiast may not have much here to get excited about, I think the real story here is the A8-7600. Especially at 45W, the numbers are quite impressive for this part.

    Of course, the other part of this story will be the adoption of HSA and Mantle. In this regard, I think AMD is playing its cards right. If you want to provide incentive for game developers to invest in developing for Mantle, that economic incentive is not going to come from providing a high-end part that tries to compete with high-end discrete GPUs. That economic incentive, and I believe it's huge, is in lowering the cost of entry to play your game.

    With the A8-7600, I believe AMD is providing a tremendous market opportunity and incentive if, with the combination of Kaveri plus embedded technologies (Mantle & True Audio), you can provide a playable gaming environment for the mass market. Admittedly, it may not be a "playable gaming environment" from an enthusiast standpoint, but as an entry point, it is quite good enough. It will be important for AMD to show that the release of Mantle for BF4 impacts performance for the Kaveri APUs in particular. More specifically, they will need to show that Mantle makes BF4 playable on a 7600. If they are successful in that regard, then I think they may really have something exciting here.

    I'm hoping AMD is successful in this, because it's obvious that the desktop CPU performance race has reached a point of diminishing returns. Kudus for AMD for potentially changing the game in the industry.

    All that said, they screwed up the pricing for the high-end. It needs to be $30 cheaper, and what is even the point of the 7700K? The 7850K at ~$145 and the 7600 where it is would have made much more sense if they want to incent adoption of this technology. The other point is they need to get motherboard manufacturers on-board with bringing more ITX FM2+ motherboards to market at different price points.
  • 1 Hide
    Au_equus , January 16, 2014 5:40 AM
    There appears to a typo or at least a contradiction on the table (first page), which lists the A10-7700K with 512 shaders. The paragraph below then says it has 384 shaders.
  • 3 Hide
    Nossy , January 16, 2014 5:40 AM
    Basically at this point it is not worth the premium $50-60USD or so over Richland and Trinity. At $180, you can get an i5 3570k at some places like Microcenter. Another disappointing release from AMD.
  • 0 Hide
    The_Trutherizer , January 16, 2014 5:51 AM
    I'm extremely excited to see the results from more HSA compliant apps myself. Some of the benchmarks I have seen are beastly.I'm really starting to think that the APU is a superior approach. With x86 performance past a certain point CPUs with traditional cores will be relegated to specialised servers in the eyes of consumers. I mean how quickly do you want to open an excel spreadsheet or encode or decode music and video? 0.5s or 0.3s?
  • 8 Hide
    nezzymighty , January 16, 2014 5:52 AM
    Quote:
    With the A8-7600, I believe AMD is providing a tremendous market opportunity and incentive if, with the combination of Kaveri plus embedded technologies (Mantle & True Audio), you can provide a playable gaming environment for the mass market. .... they may really have something exciting here.
    @ vertexx ... finally a non troll or die hard Intel/AMD fan that is making sensible points...I used to be a gamer and spent thousands, being a die hard fan of one today's chip makers. Now, as a mainstream user that has to use their money towards real life applications (rather than FPS) like a house, family, children, eating, paying bills, etc... I tend now to look for a solution to spend the disposable income on a solution that is cheap but encompasses the ability to do a little of everything...Well done AMD... please keep the innovation coming, and competition alive too keep prices down for all to enjoy...
  • 1 Hide
    rolli59 , January 16, 2014 5:54 AM
    Well if this is the future from AMD they are going to leave Intel alone in the high end gaming space.
  • -2 Hide
    styrkes , January 16, 2014 5:55 AM
    This measly increase in performance is just shoddy. Wonder what amazing story and hype AMD will put out for their next APU. I'm pretty much done with all this new advanced technology that's supposed to bring increased efficiency, performance, etc. etc. They've been doing this ever since they released their first APU. The next time AMD releases their next APU, I'll just jump straight into the benchmarks, see if that's any good.
  • -8 Hide
    styrkes , January 16, 2014 5:56 AM
    This measly increase in performance is just shoddy. Wonder what amazing story and hype AMD will put out for their next APU. I'm pretty much done with all this new advanced technology that's supposed to bring increased efficiency, performance, etc. etc. They've been doing this ever since they released their first APU. The next time AMD releases their next APU, I'll just jump straight into the benchmarks, see if that's any good.
  • 2 Hide
    Trachu , January 16, 2014 6:02 AM
    A8-7600 paired with R9-240 looks like a good deal. I belive this is a great Chance for AMD here if it sorts Crossfire performance things right Here lays the whole reason to buy APU instead of plain CPU.Why you have not commented about it in your final words when you thought about the alternatives?
  • 6 Hide
    logainofhades , January 16, 2014 6:32 AM
    Quote:
    Basically at this point it is not worth the premium $50-60USD or so over Richland and Trinity. At $180, you can get an i5 3570k at some places like Microcenter. Another disappointing release from AMD.


    Yesterday there was an HD7770 so low that you could get that and an FX 6300 for like $5 more than what newegg is asking for the 7850k. You can get an HD 7750 in that general price range with an FX 6300 now. In desktop, APU's still hold no appeal to me at all. Mobile, they have promise for sure.
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