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Power Consumption: Overclocking To 4.5 GHz

AMD FX-8370E Review: Pulling The Handbrake For More Efficiency
By , Arne Weigold

AMD FX-8370E at 4.5 GHz

For some reason, everyone seems to want to hit a nice, round 4.5 GHz when they overclock. We're not going to be the exception, even though it might not be an efficient approach to tuning AMD's Vishera core. Really, this CPU can go higher. We even managed 5 GHz long enough to boot into Windows. That required an unsafe 1.5 V though, which is unreasonable for running benchmarks.

Core Voltage

The core voltage at 4.5 GHz was set to 1.315 V in the BIOS, resulting in an actual reading of 1.26 V. This is already quite high, even though it’s still a lot more manageable than 1.5 V.

Power Consumption

At 116 W for the CPU and VRM combined, AMD's FX-8370E is still doing well, especially since the CPU’s contribution is probably under 100 W.

It's annoying that the motherboard and its voltage regulation circuit hit almost 80 degrees Celsius, though. If massive overclocking is your goal, then a more efficient platform would help.

Temperatures

In light of the previous findings, especially the relatively moderate power consumption, a CPU package temperature of 47 degrees Celsius isn't surprising. The processor's heat spreader registers 53 degrees Celsius according to the sensor under it, which isn’t much higher.

The infrared snapshot shows us that a big aftermarket cooler is capable of handling the FX processor's thermal load. Its two fans remain barely audible.

Efficiency

Does it make sense to run at a higher clock rate, trading better performance for increased power consumption? The answer isn’t clear-cut. We do see that the CPU speeds up while essentially consuming the same amount of power when it’s overclocked to 3.5 GHz. This is achieved with mostly untouched BIOS settings and a manual Vcore configured to match AMD's stock reading. Then there's the sweet spot (the point beyond which efficiency starts to decrease). We calculate this to land right around 3.8 GHz. And once you crest 4.2 GHz or so, overclocking AMD's FX-8370E probably doesn't make much sense. It mostly wastes electricity.

Again, if you're gunning for the sweet spot, it's right around 3.8 GHz. That's where you'll get sub-90 W power consumption and respectable performance. If you care more about benchmark results than your power bill, consider calling it a day around 4.2 GHz. Yes 4.5 GHz and higher is possible, but at a certain point you're going to spend too much on a beefy motherboard and high-end cooler, negating the value of overclocking outright.

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  • 10 Hide
    husker , September 22, 2014 1:48 PM
    Article quote: "However, it's probable that AMD sent us a sample chosen specifically for this purpose. Plus, there is almost certainly variance from one -8370E to the next. And so it's hard to know if the FX-8370E is actually better."

    If you pre-suppose that your sample is tainted why bother to do the testing and the article in the first place. Perhaps this is a case where your should purchase the product of the shelf in order to better serve your readers.
Other Comments
  • 3 Hide
    MeteorsRaining , September 22, 2014 12:26 PM
    The price point is a deal breaker. Its a fairly good CPU for AMD builders, but can't give it the tag of budget builder, you get i5 non-K in that price. Its moving into a higher (cost wise) territory with weak arsenal.
  • -3 Hide
    The_Doc , September 22, 2014 12:45 PM
    How to start a benchmark review? But of course, let's show how powerful is AMD in single core!

    I think we all get it Vishera isn't exactly wonderful in single core operations, but:

    A) I have yet to see any software which requires A LOT of single core power, it's 2014, if something is still single-core, it probably doesn't need all that power or il old enough to make even Vishera good at it.

    B) You are comparing a 2012 architecture to a 4790K, It's like comparing Pentium 4 to a Pentium G3258.

  • 10 Hide
    husker , September 22, 2014 1:48 PM
    Article quote: "However, it's probable that AMD sent us a sample chosen specifically for this purpose. Plus, there is almost certainly variance from one -8370E to the next. And so it's hard to know if the FX-8370E is actually better."

    If you pre-suppose that your sample is tainted why bother to do the testing and the article in the first place. Perhaps this is a case where your should purchase the product of the shelf in order to better serve your readers.
  • 6 Hide
    1991ATServerTower , September 22, 2014 2:21 PM
    I would have liked to see a power consumption chart of the following cpus all clocked to 3.8GHz.

    8150, 8320, 8230e, 8350, 8370e.

    That would demonstrate the improvements of Vishera over Bulldozer, as well as any improvements offered by binning.
  • 5 Hide
    oxxfatelostxxo , September 22, 2014 2:54 PM
    "If you pre-suppose that your sample is tainted why bother to do the testing and the article in the first place. Perhaps this is a case where your should purchase the product of the shelf in order to better serve your readers."

    1) almost every vendor does this, cpus, graphics, ect..
    2) the chip they received is exactly what you get when you buy it off the shelf, however every cpu/gpu ect varies by a small amount. The vendors simply make sure that review sites get the top end of that group. In all honesty we are probably talking 3% performance from the majority at most.
  • 1 Hide
    ShadyHamster , September 22, 2014 3:52 PM
    Any chance the older 8320/50 could be tested at the same voltages and clock speeds to better compare power usage?
    My 8320 will happily run 3.5/3.6ghz @ 1.15v as long as turbo core is disabled.
  • 1 Hide
    m32 , September 22, 2014 4:49 PM
    I've had a few 8350's that needed 1.41-1.45v for 4.5. These E models needs less voltage compared to the originals when dealing with "moderate" overclocks.

    I will probably get the 8320E for my office computer during Black Friday. $140 is the price right now but I prefer $125 or less for an AMD CPU.
  • 1 Hide
    Chris Droste , September 22, 2014 4:50 PM
    for all we know a nice, process-refined 8350 is the exact same chip under the hood, they just clocked it down and gave it a new name. someone wake me when AMD starts to innovate desktop CPUs again.
  • 1 Hide
    hmp_goose , September 22, 2014 4:58 PM
    While it's nice to see a sweet spot staked out for the OC, and really nice to hear about how much smaller the heatsink can be, what I'd like to see if the E OCs cooler/ less wattage then the two non-Es. I like to think a 8350 is better then a 8320 if you care about power consumption at all, and want to see if the trend continues with the 8370 & 8370E …
  • 2 Hide
    RedJaron , September 22, 2014 6:10 PM
    Quote:
    The price point is a deal breaker. Its a fairly good CPU for AMD builders, but can't give it the tag of budget builder, you get i5 non-K in that price. Its moving into a higher (cost wise) territory with weak arsenal.
    Precisely, which goes right along with what Igor said:

    Quote:
    Yes 4.5 GHz and higher is possible, but at a certain point you're going to spend too much on a beefy motherboard and high-end cooler, negating the value of overclocking outright.

    Far too many people forget the whole cost of OCing a chip. Sure, a 4.5 83XX can slightly beat a stock i5, but at what cost? The 6300 is a far more compelling CPU for tweakers. If you're lucky on a few sales, you can get the chip, cooler, and mboard for the same $200. And as pointed out here, unless you're pairing it with a top-shelf GPU, you won't see any gaming benefits with a pricier platform.


    Quote:
    B) You are comparing a 2012 architecture to a 4790K, It's like comparing Pentium 4 to a Pentium G3258.

    This is AMD's latest offering. The Haswell refresh is Intel's latest offering. Whatever the products' pedigrees, why shouldn't the two latest SKUs be compared?
  • 5 Hide
    jas340 , September 22, 2014 6:51 PM
    What I got from the article is that the i3-4330 is one fine gaming CPU.
    AMD is embarrassing itself with these "new" releases. It is quite sad. I wonder how many more years they will milk "Piledriver"?
  • 1 Hide
    Amdlova , September 22, 2014 7:58 PM
    the cpu price is not the problem, but a good motherboard for the cpu is too high. I don't want a crap north chipset with crap south chipset. AND i see the 990fx With fear. Amd need Update the chipset...
  • 2 Hide
    Keenan Johnson , September 22, 2014 8:19 PM
    The only issue I see with this CPU is the price of it. I really would not personally see a reason to go with this over the old 8320 or even the 8320E, which are both priced very well for their performance and will overclock similarly to this one, although the non E variants seem to run hotter. At stock, the 8370E will likely match the 8320, but costs too much more. The TDP number to me only tells me how stong a cooler I need WHEN I overclock. Bottom line is, what does it cost and how fast is it for that cost. At $200, I'd have a hard time not forking out the extra $40 for the I5 4670K. Again, not due to it's TDP rating, but what it can do for the money I spend.
  • 2 Hide
    rdc85 , September 22, 2014 8:31 PM
    Quote:
    the cpu price is not the problem, but a good motherboard for the cpu is too high. I don't want a crap north chipset with crap south chipset. AND i see the 990fx With fear. Amd need Update the chipset...


    agreed, this cpu need new (limited) mobo to operate.. this making it's a minus point...

    anyways we need to keep advocating good balanced built more often..
    I see lot's of people keep waste money in one (op) part to only be limited by another parts in his system...
    (the true potential of the system is nowhere to be seen)
  • 2 Hide
    Keenan Johnson , September 22, 2014 8:52 PM
    Quote:
    Quote:
    the cpu price is not the problem, but a good motherboard for the cpu is too high. I don't want a crap north chipset with crap south chipset. AND i see the 990fx With fear. Amd need Update the chipset...


    agreed, this cpu need new (limited) mobo to operate.. this making it's a minus point...

    anyways we need to keep advocating good balanced built more often..
    I see lot's of people keep waste money in one (op) part to only be limited by another parts in his system...
    (the true potential of the system is nowhere to be seen)


    Agreed, too many people, and some that I personally know will throw a high end K chip in their rig and match it with a $120 GPU while not wanting to overclock said CPU, and then get mad because they can't max out new titles. Recently, a friend's brand new i7 rig was out ran by my overclocked FX rig in a bet on the Metro LL benchmark due to his GTX 650 GPU vs my heavily overclocked R9 280X:lol:  He honestly thought he would win, and he was not happy with his purchase after that. It took awhile to explain to him (He's very new to the PC gaming world) that his prebuilt "gaming" rig was hideously imbalanced. It happens all too often, the new to PC guys who buy some of those prebuilts get ripped pretty hard sometimes:( 
  • 3 Hide
    rolli59 , September 22, 2014 8:56 PM
    Biggest benefit is for all the people that want to upgrade to 8 core but have previously bought boards that do have low power limits as most of the budget AM3+ boards do.
  • 2 Hide
    rmpumper , September 22, 2014 10:00 PM
    I will get downvoted for this comment but I have to say this: I find it funny that AMD fans are always claiming that power consumption is irrelevant while at the same time AMD are doing everything they can to improve efficiency.
  • 0 Hide
    Shin-san , September 22, 2014 11:28 PM
    Something tells me that Bulldozer might have been to get into game consoles. It's an architecture that's easy for people to learn, but hard to extract full power from.

    However, it seems that AMD won't be making any new CPU architectures until 2016. I'm doubtful that AMD will manage to push the clock any further in the near-future, though 5 GHz is possible. A 200W part will make your PC a space heater.

    For the 2016 build, there's a chance that AMD may be revamping the CPU drastically, but there's also the chance that AMD will just give up. The third alternative is that they will release a CPU update for game consoles.

    I'm also doubtful about the hybrid x86/ARM chip they want to make. In theory, it's sound, but I'm thinking of the complications from programming the thing, plus the potential for bugs.
  • 1 Hide
    vaughn2k , September 23, 2014 2:38 AM
    I want AMD to keep their CPU line-up alive. Therefore, an alternative to Intel's high priced processor. If not, Intel will shoot-up theirs... but please AMD make a better CPU soon. bring HSA soon! And bring back the glorious days, the Athlon was!
  • 0 Hide
    tomc100 , September 23, 2014 3:02 AM
    AMD needs to hire better engineers. This is just embarrassing.
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