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Making Sense Of Turbo CORE

AMD Phenom II X6 1090T And 890FX Platform Review: Hello, Leo
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Turbo CORE is, without question, the one feature that took me the longest to dig into for this piece. First described by AMD as a deterministic capability, I took that to mean Turbo could tell when load was being applied to three or fewer cores, at which point it’d spin down three idle cores (dropping voltage and frequency) and overclock the other three, incrementing multipliers and voltage settings.

In my preview, I said:

“As far as we’ve been able to determine, Turbo CORE isn’t as granular as Turbo Boost. It operates based on operating system P-states, so when three or more cores are at low utilization levels and the active cores are in P0 (for more on P-states, check this out), the CPU capitalizes on TDP budget to increase performance by a flat 400 or 500 MHz.”

This isn’t the case, though. In practice, Turbo CORE really just works like Cool’n’Quiet in reverse. The processor can take a default 16x multiplier (on the 1090T) and increase it to 16.5x, 17x, 17.5x, or 18x, depending on activity. At the same time, you might not even see the other cores slow down at all.

Perhaps the best illustration I can give you is a couple of quick videos. In the first video, I’m running our iTunes benchmark, converting a WAV into an AAC file. This is a single-threaded workload, so we’d expect Turbo CORE to be doing its thing. You see the thread jumping from one core to the next in AMD’s OverDrive utility. At no point do we see any of the idle cores drop below 3.2 GHz. However, the active cores do hit 3.3 and 3.4 GHz.

Phenom II X6 1090T in iTunes


Now, I fire up a threaded workload like MainConcept, we see something different. For the most part, all of the cores operate, fully-loaded, at 3.2 GHz. Strangely, we actually do see certain cores peaking at 3.6 GHz with increased 1.475V spikes.

Phenom II X6 1090T in MainConcept


With none of our test workloads demonstrating three cores throttling down in response to higher clocks and voltages from the other three, I was worried that power might be suffering accordingly. If you remember back to my coverage of Core i7-920XM, I was concerned that Turbo Boost would keep the CPU at a higher frequency more of the time, and consequently burn through battery life faster. As it turned out, I was right, and an affinity for getting more done faster meant that Clarksfield was harder on energy use.

Anticipating something similar, I logged back-to-back PCMark Vantage runs on the Phenom II X6 1090T and X4 965 Black Edition:

These two actually map very closely. You’ll notice that the hexa-core chip does tend to peak at higher power numbers. Also, the lower red lines suggest that the quad-core contender drops to a lower idle power (also quite logical). But when you average out total consumption, the Phenom II X6-based system sits at 141W, while the X4-based machine uses 135W. That’s not bad.

At the end of the day, think of Turbo CORE as compensation for losing clock rate in the move to six cores. Just because the technology can hit 3.6 GHz on the Phenom II X6 1090T doesn’t mean you’ll get the equivalent of 3.6 GHz in single-threaded applications. Fortunately, at the same time, you’re also not paying a huge power price for the small bump in performance.

Turbo CORE on a single-threaded workload.Turbo CORE on a single-threaded workload.Turbo CORE on a multi-threaded workload.Turbo CORE on a multi-threaded workload.

Of course, there’s a caveat. As was the case at first with Intel’s Turbo Boost technology, it’s entirely possible that AMD’s monitoring tools aren’t capturing the true nature of what’s going on here. The refresh in OverDrive is quite slow, and processor states can change many times per second. AMD has assured me that the behavior I’m seeing sounds right, but there’s always that chance…

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  • 29 Hide
    englandr753 , April 27, 2010 4:18 AM
    Being that I have seemed to changed my use of my pc more toward video editing than gaming I am definitely selling off my Q9550 and going with the AMD X6. I still game some but don't care to have the cutting edge video card atm so this is perfect for me. I'm buying from AMD for my next cpu! Way to go AMD! I still have another Q9550 system so don't think I'm an AMD fan boy but I do love it when AMD gives such a great value for such a great product. Everyone should...
  • 24 Hide
    jemlinus , April 27, 2010 4:35 AM
    Great. Six cores for under $200, and I don't have to change my mobo and memory cards. Can't go wrong with that!
  • 20 Hide
    Doltron , April 27, 2010 4:45 AM
    I think you should add Bad Company 2 to the benchmarks. ;) 
Other Comments
  • 9 Hide
    dwave , April 27, 2010 4:12 AM
    My 4 core Core2Quad @ 2.83 is still working everything great, so I won't be upgrading. Nice to see the price for 6 cores is very reasonable though!
  • 13 Hide
    eugenester , April 27, 2010 4:16 AM
    Finally this article comes out. I've been waiting since the morning for this. Lol but anyway, good read.
  • 2 Hide
    cangelini , April 27, 2010 4:17 AM
    Got some GTX 480 numbers in there as well txt, and the results weren't much prettier.
  • 29 Hide
    englandr753 , April 27, 2010 4:18 AM
    Being that I have seemed to changed my use of my pc more toward video editing than gaming I am definitely selling off my Q9550 and going with the AMD X6. I still game some but don't care to have the cutting edge video card atm so this is perfect for me. I'm buying from AMD for my next cpu! Way to go AMD! I still have another Q9550 system so don't think I'm an AMD fan boy but I do love it when AMD gives such a great value for such a great product. Everyone should...
  • 19 Hide
    englandr753 , April 27, 2010 4:26 AM
    Is the X6 1090T not oc'able at all? It would seem there should be some headroom for overclock to some degree. Starting out at 3.2g makes me think you should be able to get fairly close to 4.0.
  • 4 Hide
    cangelini , April 27, 2010 4:31 AM
    englandr753Is the X6 1090T not oc'able at all? It would seem there should be some headroom for overclock to some degree. Starting out at 3.2g makes me think you should be able to get fairly close to 4.0.


    I was able to hit 3.7 with Turbo CORE enabled fairly easily. It might go higher, but I'd argue this probably isn't as much of an overclocking chip as a 965 might be.
  • 24 Hide
    jemlinus , April 27, 2010 4:35 AM
    Great. Six cores for under $200, and I don't have to change my mobo and memory cards. Can't go wrong with that!
  • 1 Hide
    bk420 , April 27, 2010 4:36 AM
    Where can I sign up to buy this thing NOW. It looks good considering the price. 6 cores is better than 4 IMHO.
  • 20 Hide
    dstln , April 27, 2010 4:38 AM
    Good to hear they're getting back into the performance market and still focusing on value.
  • 9 Hide
    deividast , April 27, 2010 4:42 AM
    jemlinusGreat. Six cores for under $200, and I don't have to change my mobo and memory cards. Can't go wrong with that!


    Actually it's under 300$, but still really affordable :)  to bad i'd have to change my mobo and ram for it :)  so i'll stick to my 4 cores for the time being :D 
  • 0 Hide
    englandr753 , April 27, 2010 4:43 AM
    So, my understanding the only ocing you can do is with turbocore? 2 cores or less are working to hit the 3.7? If this is so, this is a little disappointing but as I said for video editing, 6 cores even at 3.2 sounds sweet to me. Thanks for the review and the replies! Nice job!
  • 4 Hide
    pharge , April 27, 2010 4:43 AM
    I remember we did have few articles here talking about what happen when there are multiple programs running at the same time (which I belive is closer to the reality). Will 6-core system look better when there are 2-3 program running at the same time?
    Like playing games while having handbreak and antivirus running at the same time.
  • 20 Hide
    Doltron , April 27, 2010 4:45 AM
    I think you should add Bad Company 2 to the benchmarks. ;) 
  • -7 Hide
    englandr753 , April 27, 2010 4:47 AM
    DoltronI think you should add Bad Company 2 to the benchmarks.


    I can see why you would but do you realize the time this would take to do everyones favorite game? Not a reasonable thing to do...
  • 5 Hide
    jemlinus , April 27, 2010 4:48 AM
    deividastActually it's under 300$, but still really affordable to bad i'd have to change my mobo and ram for it so i'll stick to my 4 cores for the time being

    I was talking about 1055T. ;) 
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